When you win a level sometimes you win "free play" time where losing a level doesn't cost you a heart. I intentionally didn't click to collect the 15 minute free play timer right away and did so about 10 minutes after I had won the level and, lo and behold, the timer was down to 5 minutes even though I hadn't accepted it yet. And, once the timer is running, it never stops, even though you get multiple popups that you have to respond to which, if course, wastes time on the timer. Rip off!