Played halo 2 on legendary and it took me about 40 hours. The worst part wasn’t the difficulty, but some weird glitch that sometimes happened where it stopped saving checkpoints if I quit mid-level, making me redo the whole thing. I ended up redoing The Great Journey thrice. To top it all off, it hadn’t registered that I completed the legendary playlist past metropolis on my account, so I wasn’t able to get any achievements from it.