Title: Waivers (sports)
Content:  Players in the National Hockey League are placed on waivers following any of several conditions. Firstly, players who meet a certain threshold of league experience (based on a complex formula based on position, age, and time spent in the NHL) cannot be designated for assignment to a minor league club unless first placed on waivers. Secondly, the same players brought back to their parent NHL club from the minors also have to clear waivers. Thirdly, players who spend at least one season playing in another country's major professional hockey league are placed on waivers when returning to the NHL. Fourthly, players who are released from their parent club unconditionally are placed on waivers before they become free agents. Teams have 24 hours (measured from noon Eastern Time following the announcement of the transaction) to place a claim on a player. If more than one team claims the player during the 24-hour window, the team with the lowest win-loss-tie point total has first priority. The claiming team then assumes the contract. If the player clears waivers, the intended transaction (either changing teams or outright release) proceeds.
Title: Waivers (NHL)
Content:  Players who play ice hockey outside North America during a regular season and who are not on loan from or whose playing rights are not already owned by an NHL club (that is, the player is not already on a team's 90-player reserve list such as a qualified restricted free agent or a draft pick) must also be placed on waivers if they are signed to play in the NHL. If the player is picked up by another NHL club on waivers, the player must be placed on waivers again before a further trade or loan can take place.
Title: Waivers (NHL)
Content:  Waivers is a National Hockey League (NHL) labor management procedure by which an NHL team makes a professional ice hockey player's contract and rights available to all other NHL teams. Other NHL teams "waive" any claim to a player designated for assignment in the American Hockey League (AHL) or designated for release. The process is typically referred to as "being placed on waivers." It is similar to the designated for assignment process in Major League Baseball.
Title: Waivers (sports)
Content:  Players in the National Football League may be placed on waivers at any point between July 4 to February 1. Between July 4 and the end of the regular season, the waiver window is 24 hours. Between the end of the regular season and February 1 the waiver window is three days. If more than one team claims the player during the waiver window, the team with the lowest win percentage has first priority. Once another team claims a player on waivers, they assume that players contract without the need to negotiate with the player's former club. Any player that clears the waiver window becomes a free agent. Waivers are not possible between February 1 and July 4; players released outside of the season become free agents without having to clear waivers.
Title: Waivers (NHL)
Content: 1) Between June 15, or 48 hours after the conclusion of the Stanley Cup Final series if it ends later, and June 30 of each year. ; 2) If a club has team- or player-elected salary arbitration cases, within 48 hours of the last arbitration award or settlement of the last arbitration case prior to the arbitration hearing. A third type of waivers, "unconditional waivers," applies when a player is to be given an unconditional release from his contract, either by buyout or for the purpose of contract termination. A team may terminate the contract of a player for breach of contract at any time. Additionally, a player and team may mutually agree to terminate a contract at any time. This process can only be completed if the player clears unconditional waivers. In order to buy-out a player, NHL teams give notice to the player and the league that they intend to buy-out a player's rights under the terms of the CBA by submitting the player through unconditional waivers. These waivers can only be requested during two periods: Such a player must have been on a club's 90-player reserve list at the previous trade deadline.
Title: NHL salary cap
Content:  re-entry waivers); financial compensations are listed below. If a player clears waivers, the team has the right to either loan the player to a minor league affiliate which is generally a team in the American Hockey League (AHL), or the team can elect to keep that player with their club. Once a player has cleared waivers, they do not need to again clear them for the shorter of: (1) 30 cumulative days on the NHL roster; or (2) until they have played in ten NHL games. If a player refuses to report to the minors, the team can use that as grounds to suspend the player (i.e., not pay them).
Title: Waivers (NHL)
Content:  In the NHL, each player signs what is, or is a variation of, a standard NHL player's contract. The contract specifies that the team has exclusive rights to the player playing in the NHL. Once an NHL player has played in a certain number of games or a set number of seasons has passed since the signing of his first NHL contract (see here), that player must be offered to all of the other NHL teams before he can be assigned to a minor league affiliate. In the 2005 Collective Bargaining Agreement (CBA) assignment waivers applies only to loans from an NHL club to its American Hockey League (AHL) affiliate. After a player has been designated for 
Title: NBA salary cap
Content:  NBA teams can release a player to the waiver wire, where he can stay for 48 hours (during the regular season). While he is on waivers, other teams may claim him, for his existing salary. If he is not claimed, he is said to have "cleared waivers", and is treated like any free agent, able to sign with any team (with the special restriction noted above for players who were traded and then waived). Players waived after March 1 are not eligible to be on a team's playoff roster. The deadline was March 23 during the lockout-shortened 2011–12 season.
Title: Waivers (NHL)
Content:  The 2005 NHL-NHLPA collective bargaining agreement (CBA) introduced "re-entry waivers." With limited exceptions, any player who was subject to waivers before assignment to the minors must clear re-entry waivers before being called back up if said player is on a one-way contract or a two-way contract with an AHL salary in excess of $105,000. Exceptions are players who have played in over 320 professional games (180 for goaltenders) and have not spent more than 80 games on an NHL roster in the past two seasons or 40 games during the previous season. The procedure to make a claim on re-entry waivers is the same; however, teams who claim players on re-entry waivers are only responsible for half the salary and cap hit, while the original team is responsible for the other half, unless the claimed player is later assigned to the AHL again before his contract has expired, in which case the salary and cap hit comes off the books of both teams. The CBA ratified in January 2013 eliminated re-entry waivers.
Title: Waivers (sports)
Content:  Players in the National Basketball association are placed on waivers if they are released by their parent club during the season. Other teams have 48 hours to claim the waived player. If more than one team claims the player during the two-day window, the team with the lowest win percentage has first priority. The claiming team assumes the player's contract when they claim them, however for players signed off of waivers after March 1, they are ineligible to participate in that season's playoffs. Players who clear waivers become unrestricted free agents. Players released by their parent clubs in the off-season do not have to clear waivers before signing with another club.

Question: how long do nhl players stay on waivers?
Answer: 24 hours.