We did the 12 night Northern Europe last summer and my plan was to do laundry right at 1:30 when they open up the rooms. We had just spent 5 days in London prior to the cruise so we had a couple of loads to do. At 1:30, I went directly to the laundry room only to find a sign on the door that said it would open at 6pm. We had the early seating for dinner and by the time I checked around 7:15, it was packed! Luckily our room was just 3 doors down, so it was very easy to check if any machines were free. I found that early in the morning, before 7 am was a good time and rarely busy.
Our next cruise is a btb on the Fantasy in March 2017

I was thinking that I could do our laundry the morning we are back in PC before we have to get off the ship to clear customs and check in again. Has anyone noticed if the laundry rooms are empty on the last morning? I would think since everyone's bags are packed and out of their room, no one would be doing laundry. Am I correct to assume that or would after 10 pm on the last night be better?