You change the oil so the car keeps running. Your time alone is the same kind of maintenance.

Maintenance is boring by design, and the whole point is that nothing dramatic happens. Time by yourself works the same way: it produces no visible result, so it is first to get cut when a week fills up, and the cost turns up two weeks later as a short temper and a blank feeling. Nobody congratulates you for it. The engine just keeps turning over.

Block a regular slot, same day, same length, and treat it the way you treat practice. Half an hour is plenty. Keep it especially on the weeks that look too busy for it.