in normal young healthy adults a litter should arrive more or less 3 weeks after introduction.Having said that some of the large pale selfs&reds & fawns and older mice can take longer.If there is nothing within a couple of months try a different buck.
It took one of my does five weeks before she popped. I started to worry that either she or the buck were sterile, but I guess she just didn't take on the first mating.
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