I meditate for twenty minutes often, and most times I bring myself out and it's about 18 or 19 minutes in.

It's also cool how if you set your intent, you can wake up really early such as 5 or 6 o clock. One might do this to catch a plane or go driving to a holiday.

What's really annoying is waking up a little earlier than usual and just sitting in bed enjoying the comfort, then you open your eyes to see if it's time to get up yet and an hour has passed!