This was an experimental feature that was removed because it never reached maturity. A new approach is in development: https://profiles.tiki.org/Timesheets

Timesheet

Added in Tiki9, Timesheet allows to track time spent on different tasks and projects. It uses a special jQuery plugin called jTrack, which allows to have time counters on even if the user closes the browser or logs out for some reason. It is a very useful feature for project management, in which workers are expected to record the time spent on different tasks.

More information to come... stub