When can one go to a hot yoga class (100 ~ 109 degrees) post an incision double eyelid surgery?

This is something that should be answered only by your own surgeon. In my own practice I would have no problems with you returning after a couple of weeks.

I recommend a full 3 weeks for this type of physical activity.  Immediately after surgery, the tiny capillaries are very delicate and can break open if you are too active too soon.  Eyelid surgery is a huge investment in time, energy and expense.  Returning to vigorous physical activity too soon can adversely affect the delicate healing process.  Carefully follow your surgeon's instructions.

Dear weyeh327Thank you for your question!  Please check with your surgeon about returning to your activities!With Warm RegardsTrevor M Born MD