I agree with the 15 minute increment philosophy, but not with the pick it up, put it down till later idea. When you pick something up, if at all possible, follow it through to completion or as far as you can go. Then when you put it down, you're finished with it. Otherwise it just becomes more frustrating, and if it gets in a box, it's "out of sight, out of mind". That's one way to not have to look at it, but think of all the things you can do with it if you know about it!