Try this 'online' timer to help you with your 'visit' to the QB. Nothing needs to be downloaded to your computer...it's online. I'm sure there are timers out there that you can download. This one times from seconds to hours.
I was amazed at how fast 10 minutes flew by just now while waiting for the oven to heat up and surfing the QB. FAST FAST FAST
http://www.online-stopwatch.com/