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Without pics, again, we can only guess. I have replaced several bathroom floors, completely. Actually cutting and heading off the old joists, or splicing back in. Regardless, the joists must be supported, if cut through, which takes considerable work.
Are they doing this, or just scabbing onto the sides of the old joists? Works, but leaves old rot in place. Not recommended.
How many people are involved in the work?
If it's complete floor replacement, 4 days is closer to reality. There's really no need for pressure treated wood, unless moisture is continually present. The floor will be covered by 3/4" CDX sheathing, and then, cement board, if you are tiling.
Pressure treated is generally no more expensive than good quality framing timber...The downside to PT is that it is usually still very moist from the the treating, and tends to shrink, after the work is in place. This can cause problems, even though you would probably never be aware of it.
ETA: Laminated flooring in a bathroom is just asking for extra work, later on. Eventually, it will probably start to separate. Go with tile or vinyl, if you can't afford tile.