Mine is bi-weekly but my boss cancels it every time.

Yea I do weekly 1:1s with all my directs and have done so for the past ~13 years. Pretty standard.

Mostly I had team calls. Theoretically had 1:1s with one former manager but with both of our travel schedules it ended up monthly at best.

It's supposed to be bi-weekly here. But according to HR "that's not policy, just recommended". I had about 5-6 months were I only got 2 1-on-1s, and the feedback then was good. They completely dropped the ball and blamed it on the disabled guy.

I suspect that the difference is a lot of managers end up so overcommitted that they can't handle 1:1s with all their direct reports.

Of course, that's its own problem, but particularly in places where it's hard to get headcount, the management structures get wider and wider...