How long is the campaign?

A couple hours at most. It's not really a campaign, more like a brief intro/pseudo-tutorial to the game. Nothing really exciting, I'd hop right in the 'real' custom game.

Well the length depends on how you play it. One thing i think should be done is though, is prevent menu skipping by enter, thats infuriating, maybe the menu can only be skipped after 1-10s and then all subsequent ones can be skipped instantly.