max number of multi-recipient aliases?

What is the maximum number of addresses to have in a multi-recipient 
alias? I realize a real mailing list system like majordomo or mailman is 
better for large numbers but I need to use aliases for now 'till I have 
time to set it up and need to know how many I can use before I start to 
run into problems.

Is there any hard limit in postfix?
At what number of aliases can I expect to start to run into some sort of 
problems?