I was thinking something like a folded braid or a log roll. Either of them you could hold with a clip.
I just timed myself out of curiosity. My hair is only about 33" now so a little shorter than yours but I can do a log roll in exactly 10 seconds. There's a video of how to do a log roll here which is probably easier to understand. It's just basically making a loop and then wrapping the rest of the hair around the loop and clipping it. The folded braid would take a bit longer as braiding takes a bit longer. In theory you could sleep in the braid and just clip it up in the morning but mine always look messy when I wake up.
It's hard to say how quick you can get with things. I used to be incredibly slow but the more I practice the quicker I get. I'm also really slow at anything involving twisting the hair (eg cinnamon buns) but non-twisty buns I'm quite quick at.
I'm sure there are some military/ex-military people here though who can give you some advixce based on experience.
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