Hey, I want to dry some mint with my dehydrator, but I am having trouble finding solid instructions on the process. Several websites have reccomended an "herb screen", but I want to know if this is absolutely necessary. Also, is there a general time it takes? It says to keep an eye on it and just stop when the mint leaves are brittle. Normally, when I'm dehydrating stuff, I go and do other things for a few hours because the process takes a while, but is this true of herbs, too? How closely do I have to monitor them?