You'd be surprised. I've been aiming for 20 minutes assisted by the iPod's Timer app, and I've hit 11-minute sessions that should qualify as 'naps'. I've notic

You'd be surprised. I've been aiming for 20 minutes assisted by the iPod's Timer app, and I've hit 11-minute sessions that should qualify as 'naps'. I've noticed that if it accidentally turns into a longer session, a sweet snack and a glass of water helps with the irritability a little.