Too forecast migration time, you must take several influencing factors into account:
Hardware performance.
Hardware requirements must be fulfilled according to the ARIS system requirements. You can open or download documents and the Technical Help from the Documentation Web site. Documentation is also contained in the ARIS installation package that is available in the ARIS Download Center.
The size of the tenant backup archive.
When backing up tenant data, all data is saved in one tenant archive file. It is plain to see, the bigger the file the longer migration will take.
The time needed for restoring an ARIS database in ARIS 9 can be roughly multiplied by 1.5 up to 3 in ARIS 10. If this takes, for example, 30 minutes, migration can take from 45 to 90 minutes. If the size of all ARIS databases together is bigger than 3 GB, the restore tenant action can take longer than 24 hours. This large size can occur because of a high number of databases, documents stored in ARIS document storage. In this case migrate tenant data having all databases excluded and migrate the databases manually.