Meetings at ten minute intervals

Hi. I’d like to create a series of ten minute meetings (18 x 10 minutes in a 3 hour time period), allowing students to each book one of the ten minute meetings. I have created an Event Type of 10 minutes in length. However, my Calendly page only displays a time every 30 minutes as available (e.g. 2.30pm, 3pm, 3.30pm, etc). I want to show available slots every ten minutes (e.g. 2.30pm, 2.40pm, 2.50pm, 3pm, etc)