Plan your session around what stays hidden
Deciding how much time to give Sugar Rush means accepting one thing up front: nobody knows in advance how often the bonus round comes. The result of one session is random, and the RTP does not change that. The RTP describes the return over a very large number of spins, not the next hour you play.
Before you pick a version of Sugar Rush, read the game rules, because the RTP in effect is shown only there. Each version carries its own RTP, and the rules are the only place to confirm which one this lobby runs. Check it before your first spin and before you compare the payouts.
Judging Sugar Rush by its top prize means reading the maximum win as a ceiling, not an expected result. That ceiling is reached very rarely, so the top prize tells you what is possible, not what a session will pay. Plan the stake and the time you want before you start.