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Mine is 23 so far . And 213 with the new glitch.
My best strategy is going to the power handle, open the door behind it and then go and camp up the stairs (with multiple people). You can go get the perks and go to the Pack-A-Punch machine (with the teleport nearby).
Lol my friend said that he survived 100+rounds solo, so i tried and i got 100 round like exactly on 100, i ran around in circles with wonderwaffle and ray gunz :3