The first year there was a problem with no-show instructors and students had to wait to find an instructor.
Over the years it has improved.
I can't speak for whether there are 20 or 30 minute sessions.
You can easily loose time if someone goes off and there is a full course black while everyone waits to go back.
I'm usually good for 25 minutes. Anything longer and I'm looking for the checker.
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