Lets hope I don't live to eat my words too! Haha!
Damn it! You've jinxed me Charlie.. Grouted yesterday, shower area and floor. Come in this morning, floor looks ok, but shower area is really patchy, like it hasn't dried properly!?! Weirdly, it was the same mix!?!?! Gonna leave it another day, and see if it dries out.. :-/