Looks great
I used the same tiles from topps and found them a nightmare. Had to use 9m2 to do a 5m2 bathroom floor. Most packs had at least 1 tile that was either bent, fell apart or was so heavely stained with rust it was unusable.
Your other bathroom that took 9 1/2 days should have left you feeling proud, not left questioning your tiling speed.
Without knowing the problems you faced with the state of the walls, it would be hard to estimate how long it should have taken.
Being your first time fitting limestone tiles, problems encountered with the walls and a customer constantally "clock watching", its credit to you that they got the finish they did.
Taking your limestone tiles around corner of walls and mosaic's against ceiling, could not have been have been done any better in my opinion.
I feel sorry that this thread is not listed as "how to tile correctly using stone"