This bonus is added every Monday and is a total of 15% of all of your losses in the casino during the previous 7 days. This amount won’t show up in your game balance if you play for cash. You will need to choose Play for Bonuses and only then will the balance be visible. There is also another catch which I didn’t know about this bonus at the time.
When you start playing some slot game with the cash back balance the wins from the game won’t be added to your balance. They are added to your Real Money balance and are available later after you play through your cash back balance. Again the terms for this bonus were nowhere to be seen on the site. Anyway since I had only $6 I decided to play Temple Cats from Endorphina and noticed that despite some decent wins my balance was getting close to 0. After I played through the cash back bonus balance I had about $4.5 of real money which I decided to play again on the same game. Of course I lost it all very fast without triggering a bonus or hitting anything descent.
Still my point is, if you are eligible for this bonus, play some slots that can pay more frequently. Maybe Jack Hammer or King of Slot. That way you can accumulate more wins which will then be added to your real money balance. Will keep this in mind in the future and try to get the most of this promo the next time I come back to Casino Pobeda.