We expect casual players will likely pay less mind to timers either way. (gamingenthusiast.net)
I think I would have a really hard time sticking to just 15 minutes but I need to try it with less mind - intensive - tasks on my to - do list! (moretomrse.com)
In other words, inebriated subjects report less mind wandering only because they are less aware of their own minds. (discovermagazine.com)