The Keep-it-up feature is all about creating new good habits.
Studies show that a new habit can be created in anything from 14 to 88 days (!).
We recommend you keep up an action 21-28 days - for simple actions that's often how long it takes.
But it all depends on the action - how easy it is to make part of your life, how often you do it, how small it is, etc. so stick to it until it feels effortless!