Many casinos offer unlimited cashback bonuses on a daily basis, while some will opt for granting cashback to players each week. You will also come across gambling websites that offer cash back as part of their loyalty program, which will often entail that a cashback bonus is granted when one reaches a specific level of the VIP program. All in all, the frequency of cashback bonuses tends to vary, so you will need to see what offers your casino has created and be on the lookout for any additional unlimited cashback bonuses it might introduce.