Duration Project task

In Project tasks, can you change the list of Planned duration and Effective duration as the Duration in Ticket Task ? 15mn in 15mn instead of 1mn in 1 mn then 1 hour in 1 hour.

Because it's impossible to select 1h15 for example.

These fields can they be calculated automatically when Planned start date and Planned end date or Real start date and Real end date are indicated ?

Thanks.