App Timer Mini is a simple tool to track your time on selected apps. You can estimate your time much easier. For example, you might want to spend at most 30 minutes for reading ebooks. The app timer will count the time and show the timer on your screen while you are reading. You do not need to analyze chart or graph to understand your usage patterns, instead you just read the time your spend.
The best part of all - this app allows you to see the timer all the time while you are in other apps! Go ahead and check it out:
App Timer Mini (FREE) - Android Market