Whether you bill clients by the project or the hour, you need to keep accurate records of time spent on each job.
For hourly clients, keeping correct timesheets ensures you get paid for all the work you do.
I use Chrometa time tracking software because it tracks my time as I work automatically.
There’s no need to enter any times. The software automatically tracks every minute you’re on the PC by document. It also automatically tracks your time away from the PC, too!