About 8 hours each campaign so maybe 32 hours for a casual play through. If you know some of the speed run tricks you can cut that down significantly to 4 hours each.

How long does it take to finish Halo on Legendary?

The record is 1 hour 43 minutes for a full game Legendary run. It should only take up to 3 hours maximum on legendary.

What is the hardest Halo to beat on legendary?

Halo 2s Gravemind is one of the hardest halo missions for just how unfair it is on Legendary. Before the title crawl fades away in the first few seconds of the mission, theres a good chance the player is already dead.

What do you get for beating Halo 3 on Legendary?

EOD armor In Halo 3, you unlock EOD armor for beating the campaign on Legendary difficulty.

Do you get anything for beating Halo Reach on Legendary?

There are 2 achievements: one for beating campaign on legendary and one for legendary solo. After checking first. There is no tags, no armour, no customisation at all, unlocked for doing it in legendary. Its quite literally just a sense of pride.

How do you speed run in Halo Reach?

2:0420:05How Speedrunners beat Halo Reach in 1:30:13 - YouTubeYouTube

What is the easiest Halo on Legendary?

Halo 5 is easily the most manageable Legendary campaign out of the whole series, solely due to the added teammates at the players disposal.