FogBugz allows you to enter estimates right on the main list page, in grid view. You can also enter an estimate for an individual case while editing that case.
To enter estimates from the grid view:
To enter estimates for a single case, edit that case and enter the estimates in the space provided.
Estimates can be entered as weeks, days, hours, or minutes. For example:
1 week
2 days
1 day 4 hours
15 minutes
These may be abbreviated using w, d, h, and m. The previous examples can be abbreviated as:
1w
2d
1d4h
15m
You can change estimates as many times as you want, as you learn more about the work required for a task. However, as soon as you start working on a case (using timesheets or the working on menu) FogBugz takes a snapshot of the current estimate and stores it permanently as the original estimate. Later you can go back and look at your original estimates versus actual, elapsed time to learn how to estimate more accurately in the future.