I don't think frequency is the issue.

If I use nostr for 15 minutes per day, I will post all my notes in that small 15 minute window.

For people that follow me and that check their feed at that time, it may look like spam since all they see is suddenly maybe 8 notes from me.

Maybe it would be a good idea to have client-side scattering of notes throughout the day so that they are not so clustered.