Suggestions for setting up appointments of various times

Requesting ideas on how to set up appointments so that people can select 1-hr, 1.5 or 2-hr sessions.

I don’t see this as a built in option. One thought is to set these up as 3 different choices. That could even allow for a discount on longer sessions. 1-hr: $40, 2-hr $75

The discount feature isn’t as important as allowing people to choose among the 3 options.