I used to calorie count twice a week when on the 5/2 diet.
I lost too much weight and didnt go on the diet to lose weight but for other benefits which worked!
So i cut it down to once a week for about 2 or 3 years.
I used to religiously count and weigh everything, but have now stopped this.
One day a week I eat less than normal and just have a salad for dinner and a small piece of fruit for breakfast but I do not actually count the calories any more, as I used to hate this one day a week I was so restricted!