Hello Mohammad
According to Cisco:
After a default of 30 minutes the router that originated the entry resends the LSA, with a higher sequence number, in a link-state update (LSU), to verify that the link is still active.
If however, an LSA is expected after 30 minutes and it doesn’t arrive, the information of the LSA is retained until the LS age or the LSA maximum age is reached. This by default is 60 minutes. So it’s kind of like a dead timer, where if no LSA is resent after 60 minutes, the specific LSA is removed from consideration by the OSPF routing calculation.
I hope this has been helpful!
Laz