I've found what works best here is just switching to every 2 weeks or every 4 weeks. If you have little to talk about in a 1:1, feel free to end early, and then double the length of time until the next one.

Yep, time box it, so you know you have time, but allow it to e shorter!!!! Or reschedule. Mostly I had 20mins, every week with most. Some became 45mins or more, as we rambled on about tech or some other topic. And one requested it once every 2 weeks. Fine with me. If that makes them feel better, please.