If you’re looking for a time tracking for N900 maybe this GPE timesheet can help you. It is a simple time tracking tool with user friendly interface and easy to use.

Another is Timr easy and powerful to use available on most mobile phone. It tracks it all when you log in and when you log out. It supports a preset of your weekly hours of work, holiday calendar and different working time types like office time, business trip, compensatory time off, etc.

You can also check this blog that you might be interested to read it discusses more information about time tracking tools and its features.