After a cat is shaved, the rate of fur regrowth varies depending on the breed and individual cat. Typically, short-haired cats will begin growing new fur about a month after a shave, and it will gradually grow back to its original length within two to three months. However, long-haired cats have a longer regrowth cycle, generally taking about six months to return to their previous length. To promote fur growth, owners can provide their cats with nutritional supplements such as coat-enhancing powders or nutritional pastes. In addition, after a shave, owners should pay close attention to their cat's health, especially in cold weather, and take measures to keep the cat warm to prevent illness.

Please note that the speed at which a cat's fur recovers may vary from one cat to another, and the specific timeframe will depend on the individual cat's condition.