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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...
Diestrus- This is the period after estrus and mating. The cat goes through different reproductive stages and if it is pregnant, pregnancy will last for 60 to 66 days before she gives birth to her kittens. In case the cat is not pregnant, she will stay away from heat cycle for at least 30 to 35 days. Anestrus- This is the phase of sexual and hormonal inactivity between estrus phases. It could last for 2 to 3 months.