Depends. Do I have a space suit with oxygen, because if I don´t then not too long! You could certainly live weeks or even months, but your body doesn´t really enjoy it after awhile. So you lose muscle mass, even if you try to do sport, and after awhile it´s probably not fun to go to the bathroom using a special apparatus. I think one of the biggest problems is that, no matter how much you like the other astronauts, it is probably quite psychologially hard if you are a very social person, or have a family.
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