how much time will the human race last?

Logically speaking I'd say until one of the necessities to maintain life no longer exists.
But I'm pretty sure we are likely to be the first species to wipe itself out rather than be the victim of something beyond our control. Like any other animal.

Oh, I hope not much longer. We are a disaster and totally ruined this planet.

300 more years give or take

Longer than many here wish for

till it evolves into playdough