infrequency

Osmond Orgreave entered the room, quizzical, and at once began to tease Clayhanger about the infrequency of his visits.

The infrequency of his visits to her of late, and something in his manner, made her uneasy and a little bitter.

The real cause of his concern being, I suspected, the infrequency with which his cash register tinkled.

How can we possibly know but that such infrequency is direfully injurious?

What she referred to, was simply the infrequency of the visits.