Unless
You have an experienced fire team that has worked together.Zero hour is impossible.
Everyone is rushing,bumping each other off Ledges et cetera
I just did a fire team and each of us only died twice and we died just about 25 seconds short.
F*** stupid
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No way ordinary Zero Hour is impossible. I'm a distinctly average player and I've soloed it. Legend is a different matter. The fights are fine but the timer is just too tight if you aren't great or fast at platforming. Should be 25 mins.