I got home last night to find that the floor still wasn't dry. Essentially, if the dehumidifier isn't on, the floor isn't drying. I said "drat it all", then started laying tile anyway. I now have half a nice looking floor. I hope it stays stuck down. Most of it should. Some parts were "correctly" tacky, some parts were too sticky, and some bits were still a liquid. No tile wanted to come back up.