Remove varnish from wooden floor?

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We need to revarnish a wooden floor as the varnish isn't looking good and is patchy in places. What's the best way to remove the old varnish please? DH left me with 120 fine sand paper and a block which I think is meant to be used to sand in between varnishing, NOT to sand the floor!!! I started sanding by hand and realised I'll be there forever and a day.... Apparently, he thought that's what you use lol.

So, apart from renting a sanding machine is there another way around? The area is around 8 metres squared.

I think you will either need to hire an industrial sander or pay someone to do it.
I don't think you will get far doing it by hand! We had the varnish on our floorboards stripped, it cost £300 to sand and oil ours in the lounge. I think it's quite a time consuming and dusty job otherwise.

Hire a sander.
One of these www.hss.com/hire/p/floor-sander-240v
But its dusty...so very very dusty.