What about setting a task reminder in Outlook?  Or buying a cheap watch with an alarm on it and set it for 15 minutes.  Do what FlyLady says... take your 15 minutes but use a timer to remind you when it's over, and then quit what you were doing and return to whatever... work in your case.  Those are the solutions that come to my mind right now.

CountriGal
Deskdemon Editorial Board Member