How do I set My appointments as full days


I wish to use Appointments+ but for my services they are full days 8:30 am - 4:30 pm.

1. How do I set for full day (client not to see 8:00 am by 8:30am - 4:30 pm for appoint time selection
2. how do I set my times to start at 8:30 not 8:00