Found it boring. 15 hours I reckon, after that nonsensical story line, which I was with until I realised that freaking nothing is answered at all, I lost interest fairly fast I only got to lvl 21 and put it down. I would of got higher if I didn't try to do heroic strikes with my friends where I would get one hit nonstop when I was about lvl 17 but I also wouldn't of played as long.
edit: actually played 24 hours, campaign is actually quite long. But I want to take an hour or two of for waiting in orbit for friends to finish something.
Systems Owned: PS1, PS2, PS3,PS4, Wii, WiiU, xbox, xbox 360, xbox one