I always dry sensitized papers in a relatively light-proof box usually for 3+ hours. Of course, humidity can slow that process. I recently went from using COT 320 to Goyu Kozo, and was surprised how long the paper remained wet. I was doing a 7X17 negative and the paper had been drying for at least 12 hours. I made the mistake of discounting a somewhat moist feel to the paper, and printed without an interleaved sheet of Mylar. The print was mottled and the negative was ruined. Fortunately, I was able to retake the scene for a new negative.