In my experience, it takes about a month or two for a male to breed a harem and the females to become noticeably pregnant. I think in about a month a female can go through two heat cycles and should be pregnant by that point but I only bother remove the girls to nursery tubs once I certain that they're expecting pups so I tend to keep breeding groups together longer.
But yeah, 1-2 months would be my word.
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