The main FAQ for editing explains how their grace period works:
In order to prevent a series of tiny edits from showing up in the revision history, a single user who edits a post is given a 5-minute grace period, except under one of the following conditions:
- The previous revision was a rollback.
- The new revision is a rollback.
During this period, any additional edits they make are collapsed into the same edit in the revision history, displaying only the final outcome of all their edits within that 5 minute period. The grace period ends after exactly 5 minutes, or if:
- Another user edits the post, at which time their grace period begins.
- A comment has been added to the post since the previous revision by anyone other than the editor (ignores deleted comments).
- If the post being edited is a question and an answer has been added since the previous revision (ignores deleted answers).
- The question has been closed since the previous revision.
However, it doesn't mention that the grace period for suggested edits is actually different, as explained here:
While your suggested edit is still pending review, you are in your grace period. Any further edits you make will get combined into the pending suggestion.
If your edit has already been approved (or perhaps rejected) and review has completed, further edits will create a new suggestion for review.
In other words, a suggested edits grace period can be much shorter or longer than the normal 5 minutes users might expect. And the actions that end an edits grace period don't appear to affect suggested edits.
- add an entry on the grace period to the Suggested Edits FAQ.
- mention in the grace period section of the Editing FAQ that the grace period for suggested edits is different and link to that FAQ