How long after you stop mirtazapine does the weight come off?

I have been on 30mg mirtazapine for a year and a half. I started weaning off about a month ago, taking 1/4 pill now. My weight hasnt budged yet. I am 5ft 3. My normal weight is 135 and I topped out at 170. Currently sitting at 165 and it hasn’t budged in a couple months.