If your use is compulsive
The World Health Organization recognises Compulsive Sexual Behaviour Disorder as a real condition with diagnostic criteria. We think most men who want to cut down do not have it. Most is not all.
Some signs it may be you: you have tried seriously to cut down and could not; it has continued after costing you work, money, health, or a relationship; you keep doing it after it stopped giving you anything.
If that is your situation, setting a number will not fix it, and we are not going to pretend otherwise. You need a clinician, not an app.