After playing Tut for awhile , I thought I would keep track and count the number of spins between bonus rounds. My balance was about $80.00 at the start, and my wager stayed at .25cents . The first one after I decided to count took forever, but that one was the worst. The two screenshots are from the last bonus round. The 5-symbols came in during the bonus, and the second pic is the end result. Here are the tallies once I started keeping track:
300+ spins (lost count.. a few over 300)

22
5
47
264
64
217
65
37
189
9
265