Archivelogs are used to synchronise the Standby, there is a legitimate delay in any DR solutions, since the archivelog from the primary must be sent to the Standby site and applied, but this will also be based on the factors like:
- Size of the redologs.
- Number of archivelogs generated in a day and size.
- What is the application environment (OLTP/DWH)
But rest assured in case of any disaster scenarios, activating a standby site is very straight forward and an easy process using Dbvisit product and can be done using a single Command Line or by using a GUI interface.