I refurbished a maple floor a long time ago, not even half that area and I wish I never did it because it absolutely killed me.
I was very apprehensive about doing it in the first place and if it wasn't for a sorta friend who was begging I wouldn't have touched it anyway but a bit of young naivety and being paid what I thought at the time was decent money for it... I went
"Alright, can't be that hard can it?" said he who had never sanded a floor before.
Hired a big belt sander that's a bit like a big vicious Dyson and one of those edging sanders that's a bit like a ROS on steroids for about £100 and got to work, no word of a lie it took
two days to sand this fairly small area back to a decent looking face and almost every part of me was aching by the end of it, the amount of dust
everywhere was absolutely staggering on account of the fairly archaic belt sander spewing it everywhere so I probably spent another half a day clearing dust in the room and then to the finishing, which took another couple of days and I still wasn't very happy with it because there were quite a few darker patches of maple coming through where I hadn't sanded the UV damage enough.
Whilst I wasn't technically out of pocket it certainly was not enough to cover the absolute ordeal I went through (and I really could've been doing something else that paid far better) and I swear on my life I will never sand a floor for anyone ever again and I'll leave it to some other poor bugger to do. Just remember the only reason they're approaching you is that they've probably had a quote or two off floor refurbishers and they don't like it so they're trying to find some oblivious sod to do it for peanuts and break his back at the same time.
Oh yeah, back to the original question... No idea, I
won't do floors