In 2 and a half hours or less I don't see how their gonna deal with the Mary Jane thing, the rivalry, the space journey, the fighting itself and the closure to the situation.
Anyway, how's he gonna defeat Venom? He can no way kill him. They'd never do that coz that's movie making suicide. So he'd use sonics or fire, in which case Eddie could reveal his identity being that he knows who he is. They wont let it end with Venom beating Spidey.
I fail to see how this would work in the space of a few hours.
-AC