Mr. Mike, Here's what I do when I hit the 36 hour mark. I shut the machine down and place the trays in the freezer. I defrost the unit using the defrost mode and a small space heater blowing inside the chamber. Usually defrosted in about 20 min. Turn the machine back on and let it cool down for 40 min to an hour. Place the trays back in and adjust the cooling time to about 4 hours. I then adjust the drying time to about 4 hours. I have noticed that after an hour or two under a vacuum the screen shows somewhere in the 200 mt. If I let it go it will eventually get down into the low 100 mt. I figured it's pretty dry then since the vacuum is so low while it's drying. That was my question in the previous post. When I see a very low mt. is it safe to assume that the food is dry and is just counting down the drying time that's set when the machine starts up? I have figured out that the FD is programmed to respond to various mTorr targets. I'm trying something different tonight. I have four trays of chili that I put in the trays last night and were in a freezer for 24 hours while the FD was in use. I'm going to set the cooling for 4 hours and when 20 hours is up I'm going to defrost and start the process again with 4 and 4. I know I'm pushing the machine with 4 trays of chili. A lot of water in the chili. I'll let you know how that works. I can't post again until the 3rd because of the restriction on a newbie but will let you know as soon as I can. You stated that after 36 hours you know the food is dry and that the perpetual cycle has begun. Do you stop at that point and store your food? I'm doing this for long term storage and want to make sure that all the food is dry so it will store long term safely. Believe it or not but I have read all the post on this topic.