Mice: What is their breeding rate in the wild?

Question

How long does it take for baby mice to mature into breeding mice? I have heard about a month--is this true?

Answer 1

I thought mice could have babies every 21 days. My friend buys them for her snakes. I also recall her saying something like a month from baby to mature.

Answer 2

not long at all. then when they do, the reproduce by 4 or 5 at a time. a few weeks id say