How often should I adjust calorie intake goal?

Hi there!!
I'm looking for help to find out how often I should recalculate my calorie intake.
I am female, 41, 225lbs work a desk job and work out 3 days a week. I started eating 1200 c/day and didn't lose anything, I upped it to 1700c/day and have been losing steadily.
I am now down 12lbs from my start weight and am wondering if I should change my intake every 10lbs, or when I see my loss slowing?

Thanks!!

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