The email time window mins starts when the post approved. After the email time window mins time an email goes away to the user about the post approved and an other email to the other user for example whose post was replied to. So these emails goes in the same time to the recipients.
It depends many things the edit history is shown or not.
For example:
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If you edit other user’s post, the edit history is always shows on first time then if you edit more things in the grace period then it won’t create a new revision just merges the changes on that post and the next revision will only create if you edit the post again after the grace period. Or other user edit it again…
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If you edit your own post after approve than the edit history won’t show in the
editing grace period, however there are other settings which can overwrite the grace period time. The editinggrace period max diffandediting grace period max diff high trust. So if you edit more character than you setted up these settings than it will create a new revision.