Currently, one of our migrations has stalled on step one. I need do some testing and was thinking about kicking off another. A previously deleted migration took less than half the time of where I am now.
In case anyone was wondering how long these migrations take:
Previous Migration (17GB) took around 13 hours. Now I'm at 20GB and on hour 24...
Thanks,
You can run multiple dry-runs concurrently, but should be for different collections, also I believe the number of import requests that can come from a tenant in a day is capped to 5.
Regarding the migration time, it's depended on the actual size of collection database.