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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...
Normally cats stay in heat for 4 to 10 days, which occurs repeatedly during the mating season since the cat reaches her sexual maturity. However, the mating season asks for more detailed description. Being in heat for a long time can be boring to a cat. Cats are seasonal breeders, which basically means, they can go in heat only if the daylight is present for more than 12 hours. Normally, this means cats can go in heat for a period of six months between early spring and early autumn in the most part of the world. However, not all cats obey this.