Anyone beat Halo 4 single player yet? Question

[Geosurface]

I'm at the part where you're on the huge vehicle Mammoth or whatever, the rolling platform where you're calling strikes with the mini MAC gun, and I am getting ready to play again tonight after starting last night.

I just want someone who's finished it to tell me in their estimation, percentage, hours, or both... how far I am from the end?

it would help me plan my evening

thanks

[Atty]

About 3-4 hours.