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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...
When a female cat goes into heat, it means that they are ready to have litters of kittens. If the cat mates while in heat and becomes pregnant, the pregnancy lasts 60 to 64 days on average before giving birth. If the cat mates and doesnât get pregnant, it may take up to 30 days before the cat goes back in heat again. If a female cat isnât spayed, the cycle continues in this vein until the cat has kittens.