Hello, I give hockey lessons and customers choose their lesson length. Is it possible for a customer to choose how long they would like their lesson to be. For example they can chose if they want a 15, 30, 45, 60, 75, 90, etc. minute lesson? Also, it would be great if they could view my calendar to see what times are available. That is, if they wanted a 60 minute lesson and only a 30 minute lesson for that day was left they could still see the 30 minute lesson as available. Than you in advance! Sincerely, Marco