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It was 3 seperate rooms plus a hallway (rooms were roughly 3x3m). I think it probably took me ~week per room which included removing other flooring, cutting boards, fixing, oiling and pretending to do a day job. I think I probably spent about 3-4 hours a day on it. I think it could be done in 2 days if you don't have other stuff to do. I don't think screwing the boards added a meaningful amount of time, its all the other stuff that adds up IMO.
@Hovis I used the tongue tite screws when replacing an entire ground floor of flooring. You get free bits with each pack, but they don’t last long. I just got some more bits and went steady. It may have been quicker with a nailgun but like you I wanted the ability to remove the boards if needed. Once I’d fitted the floor I sold the house and moved so it was fucking pointless, but I had good intentions and I would use them again.