Different intervals for 2 different services

Hi.

When I create in settings "Additional base time (minutes)" for five minutes, and I save, I can´t set up in the "Services" "Duration (mins)" at intervals of 5 minutes.

I have created 2 Services. The first shall have "Duration (mins)" 10 minutes. The second shall have "Duration (mins)" 15 minutes.

Can I set different intervals for 2 different services?

Thank you.

Have a nice day