Posting times and repeats
Set times per account, let Insights suggest them, and repeat strong posts.
Each account has its own timezone and posting times (Settings → Posting times). New posts and bulk scheduling fill the next open time.
Insights → Best times shows when your posts did best; Use as my slots copies those times.
A published post can repeat every few weeks: a copy is queued into the first open slot. Repeat needs the post's files, so they are kept while repeat is on.