Simple definition
Active Directory Recycle Bin lifetime determines how long deleted directory objects remain recoverable.
Purpose and use
AD Recycle Bin deleted-object retention defines the phase during which restoration with retained object information remains possible.
How does it work?
Deleted-object lifetime must be distinguished from tombstone lifetime and the recycled-object phase.
Example and verification
Before relying on recovery, verify that Recycle Bin was enabled at the relevant time and inspect effective forest settings.
Points to watch
A common duration in another forest does not establish yours. After transition into selected cleanup states, Recycle Bin recovery no longer offers the same capabilities.
In short
Recovery planning should reflect the actual deletion lifecycle and include appropriate backups.