Step 6: Monitor often
It will take a little while for the can to heat up initially, but you really don't want the temperature inside the can (measured by the long-probe thermometer) over 130F. Remember that environmental factors like wind (or still air) can affect the temperature in the can, so it could hover at one temperature for an hour or more and then change temperature - for me it seems that it can hover for the first hour ot two and then rise 25degrees or so in a few minutes as it gets close to the end of the heating process.
If the long-handled probe goes over 130F, unplug the device, wait for it to cool, remove your bag from the can, and remove a string of lights, and go back to step 3.
If the long-handled probe can't get up over about 100F then the internal contents of your luggage cannot get up to 125F. Unplug the device, remove your bag, and go back to step 3 but add another string of lights.
Experiments with this can show it takes 2 to 2 and a half hours to get the temperature measured by the remote probe in the center of the luggage to 125F