Theres no set time. Depending on the dogs it may be a short or long time. They "tie" together & you must make sure your bitch doesnt run away with male still tied as it can damage the male. We often tied the female to the clothes line or something solid to prevent her from running. If 2 dogs are in a secure yard together they may mate several times a day for several days. Some dogs take longer than others, theres no set time. Ofen 1 mating can get your bitch pregnant but if you are paying for a studd its usually done twice 2 or 3 days apart.