In Log-shipping what is load delay period on secondary server - Skipping log backup file since load delay period has not expired ....

During logshipping, job on secondary server is ran successfully BUT give this information

"Skipping log backup file since load delay period has not expired ...."

What is this "Load delay period" ? Can we configure this somehow, somewhere ?

NOTE : The value on "Restore Transasction Log tab", Delay Restoring backups at least = Default (zero minutes)

Thanks