So i got 20 superspins on Book of Seth when deposited on casumo today, never played this book of dead clone before and got the bonus after 4 or 5 spins and landed fullscreen with the top symbol
Won a total of 5240€ and now i have to wager 158k € , so sad :E
I once got 50 spins with value of 50 kr.,(7 euro) pr. Spin got the bonus two times, and won over 10000 kr. (1500€) i had to wager it 35x, but I did it in about two weeks. So it is possible, i wish you the best of luck. Please let us know how it went