That would be hard to say.....many breeders may do one repeat, other breeders may never do a repeat. The philosophy that I have heard is that IF you get everything that you want out of the first breeding then why would you bother repeating it? I don't know I repeated a breeding (first litter is 3.5 years old, 2nd litter is 6 months 2 weeks) and I'm just as pleased with the 2nd litter as with the first. Great movement, beauty, brains, drive. Its kindof fun with the 2nd litter....knowing how much the first litter accomplished....so its hard not to have higher than average expectations with litter #2.
I have never personally heard of more than one repeat breeding.....and for myself personally would never do more than one repeat......let's face it the majority of bitches that are owned by COE breeders may have 2 possibly 3 litters before being retired and spayed. Its nice to chose a different stud dog in between repeat litters for instance and having the opportunity to compare and contrast pups from the litters.....gives the breeder a nice idea as to their bitches' contribution to the babies.
Also something else I would stress is the time between initial litter and repeat breeding.......its nice to OFA the offspring of the first litter and see what you get before you repeat it and god forbid

end up with 2 dysplastic litters or something.
If a breeder was doing back to back repeat litters, that would send up red flags for me because I would like to see the OFA results on litter #1.......before embarking on litter #2....just my thoughts!!
Heather Peters