Unique time slots

Custom Time Slot According To Service Duration Specify time dedicated to your service.
I have a client that has pottery classes at different times of the day. Each class is 120 mins in length. When I test the plugin for say Tuesday and choose a class it shows me time slots every 2 hours. Fine, but there is a class at 2pm and then a different class at 6:30pm. So how do I set up custom time slots for each class? Each day is different, or is this a pro version fix?
Example:
Class Schedule:
1. Tuesday:

2:00 p.m. Groupon class
6:30 p.m. 6-week Wheel class

2. Wednesday:

10:00 a.m. Groupon class

3. Thursday:

10:00 a.m. 6-week Wheel class
6:00 p.m. Groupon class

4. Friday:

1:00 p.m. – 4:00 p.m. Private classes by appointment

5. Saturday:

10:00 a.m. Groupon class
2:00 p.m. Groupon class