Re: how long?
I have a very hard time lasting through a day of school without doing it. I do it when I get up in the morning, and I'm ripping my pants off as soon as I walk in the door from school in the afternoon. Then, I do it at least once more again before going to bed...and sometimes I do it again in the evening. So, I do it 3-4 times a day. To answer how long, then it would be 6-8 hours.
*Proud to be ME*