thing about robo is to let your rev countdown to expire, if you're a non-cleric. And to always, and i mean ALWAYS save 1 heart within the last 2 mins of robo. That way if you don't get a rev when it's about to end you can pop it and get your prize for succeeding. My first time doing robo, I was poping left and right when at the end, clerics are just too busy trying to stay alive with a dozen mob after them. They won't have time to rev. So heed my word of advice and save a heart for the last 2 mins and pop it 2-3 sec before KQ ends
