To ensure your teacher has time to prepare for your and other students' lessons, a scheduled half-hour lesson will actually last 28 minutes. Scheduled one hour long lessons will actually last 57 minutes (and lessons longer than one hour will always end 3 minutes early). This is important to ensure your teacher has time to prepare for the next upcoming lesson!

Yes, absolutely. Each lesson you schedule can be whatever length (in 30 minute increments) you choose. For example, you could schedule a 30 minute lesson tomorrow, a 1 hour lesson for next Thursday, a 30 minute lesson for next Friday, and a 2 hour long lesson two weeks from now. Scheduling is extremely flexible.