I don't know if they have a cut-off time for when you can arrive, but I would recommend not being late. It is step by step painting. So if you're late, you'll miss out on some steps. I usually get there 10 to 15 minutes before the session starts.
Starting with the instructor is important in order to successfully follow the step by step instructions.
Definitely 15 minutes early to get situated and start on time
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