4 would be about ideal. I have some Mylar on hand and as far as canning goes We could set it up so each one goes home with 7-8 pints of meat and the knowledge to do it themselves.
Start with cooking/prep tips and tricks then once we get it running switch to Mylar for the 90 min that the jars are processing. Total time would be about 3 hours.
Mylar would require for you to bring your sugar/rice/pasta Or whatever you wanted to take back with you. ..