I do fortnightly 1/1s with my team members (individually) for half an hour. The time is set but this can be in a room or a walk or over coffee. I had given them a choice of weekly or fortnightly and most chose the latter (those wanted it more frequent still get it). However my policy is that we do not wait till the 1/1 to discuss things that can be discussed sooner (especially things like feedback).

What worked for me (through experimentation and error) is I try hard to get folks to not talk about project status in the 1/1 (we have standups and planning for that). It is after all their time and unless I have direct feedback on behaviours I prefer to make it all about them. Their problems, Their goals, their dreams, their ambitions, interests and so on. After all if they are not most inspired being in my team I want to make sure I can find them work/projects/teams that they would be more aligned with (and knit that around timeframes).

At first the things that would not go well would be running out things to say. Either due to shyness or introversion or general fear of a new manager. The other side was me accepting it and moving on. While deciding when to dive deep and when not to is subtle, often zooming out on their future and then coming back to skillset often kicks off a good discussion (and some fine action items for both of us).