mate?breed

Question
how long does a female bichon have to mate as far as age ?

Answer
It depends on many things.  Better for a vet to awnser.
Also before breeding ensure your dog does not have the big bichon genetic problems.  Do do this you must have at least 3 generations certified clear.  Juvinile cataracts, Patella Laxation problems, are 2 of the biggest.