It all depends on the complexity and the included options. For example, the usual Castle Nathria boost for WoW Shadowlands on heroic difficulty in the form of a single loot run through all bosses of the raid will take our boosters about two hours. With the "Self-play" option enabled, the time may differ, since the game will also depend on your actions. We recommend not enabling "Self-play" for the fastest passage of the Castle Nathria raid. And vice versa, enable this option to get the most out of the game!