not a plumber but sounds pretty clearly like a 3 day job to me
1- remove old stuff
2- add new stuff
3- put a nice finish on it + dispose of stuff
They are talking for invoice purposes.Glad you're not a plumber! Much quicker job than that.
Well it's not the final physical connection that takes time even with solder. It's the lifting boards and drilling holes in joists.New pipework takes 10 mins these days with plastic.