After gaining 3-wins, a 22-hour timer begins before Loot Rewards for wins become available again.
Once Loot Rewards are available again a new 22-hour countdown timer starts running behind the scenes. This timer counts down even while you work on gaining the 3 wins. When this timer reaches “zero”, Loot Rewards will become available again.
If at this time you are still working to get the 3-wins, once you do get them you will immediately be able to get Loot for 3 more wins. However, you can only "stack" two 3-win runs for loot, after which you will need to wait 22-hours.