In my personal experience as a teacher, I've found that with one-to-one students, a one hour class is far too short but two hours is too intense and long.
I believe that 1.5 hours is a good length of time in order to make a nice, neat, decent lesson where there is time for both input and practice.
What do you think? This question goes out to teachers AND students. I'm interested to know your point of view.
Should Verbling offer 1.5-hour classes?