Duelbits has a happy hour promotion for slots fans especially if you're really like to gamble on Pragmatic play slots, below is the requirement how to join it.
Click on the Opt-in button before 21:59 UTC
Make a deposit of at least $100 between 17:00 and 21:59 UTC (after you opted in)
Wager your full deposited amount across the eligible games between 17:00 and 23:59 UTC
Get 20% of your qualifying deposit amount, up to $100
In short you can get 20% of your initial deposit by completing 1x wager requirement in specific time, the promotion will start from next 11 hours from this post, so you still have a time to prepare. I think the requirement is really easy to complete, not like the requirement in welcome bonus, don't miss this limited promotion!