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Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year.I advise unless you want kittens to keep her in at these times.Source(s): http://www.bestfriendspetcare.com/Pet_FA...at's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times. Source(s): http://www.bestfriendspetcare.com/Pet_FA...
How long will my cat stay in heat? (Danielle - Iowa) If your female cat does not mate, she will go into oestrus as often as every two to three weeks, for several months each year, until she either mates or is spayed. Cats as young as 4 months old can go into the heat cycle, and they should be spayed as soon as possible unless they are pedigreed and you wish to breed from them.