RE: Mouth Calls - How long before you replace them?
As long as you keep them in the freezer and put a toothpick in between the top reed and the one beneath it, then you should get two seasons out of it.
Since I run my diaphragms all the time I usually get 4 months out of one before the latex stretches. I have a press, so I make mine for the correct tension I use on each call I make. Good luck and God bless!