Bug 1036928 - Allow to set longer time estimages as 60 minutes

Closed the previous pull- working only on this branch now.
You have the same logic in two places here (`form_valid` in two views). We should avoid code duplication wherever possible. If you were to place this logic in the form itself (in `forms.py`) instead of in the view, I think you could find one place to add it instead of two.