I think motivation comes from success.

We teenagers complain about hating school all the time. I bet most of those complainers have bad grades. Now if you were to look at the people with good grades, they are probably motivated by the good grades to keep doing better.

I think if someone took a few weeks, motivated or not to lose weight, they would be more motivated to lose weight after they see that it is in fact possible to do so. As far as the time goes, they just have to keep themselves busy and find something to do. I have a favorite TV show that comes on every wednesday and because I have a pretty busy schedule, it seems like the new episode (or something to look forward to) was on just the day before yesterday.