A. Month to do this sounds all kinds of wrong
As said, my bathroom has just been refitted, ans I’d say the floor took them three days maybe four, they lifted the floor boards, relaid ply, then another layer of something, and then put a layer of some leveller on, then after the weekend tiled, then when that was dry, they grouted it.
For my daughters en-suite, they asked about the loo coming out but I wasn’t keen, so they tiled round it and did an excellent job, but it’s u shaped at the bottom so nothing to be tiled behind, there was ply down there, so they laid that layer of something else on top of it that I referred to earlier, it’s like a pale grey plastic heavy layer thing, and then tiled on that, the next day when it was dry they grouted it.
I can’t see how it’s four weeks work.