At least 1/2 hr before 1130
11:00 am. They open 12:00 pm.
From my experience when i went at 1pm on a Friday after Christmas, there was no line at all. Lincoln center TKTS is way better than the tourist trap at time square.
Close to the time to go to the shows. However, if you want to see a very specific show, you have to buy early because the tickets ate sold out. There is an app fir TKTS that you can download and check every day.
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