[rossagrant]

Not sure on the x minutesthing but you can certainly only show the edit/ delete links for admins and mods by editing some code.
You need to edit 2 files:

bp-activity-templatetags.php and topic.php

You will see permissions on displaying the links.

Look for ‘bp_activity_delete_link

Delete the other permissions so only

‘is_admin’ is shown to only display links to admins.