migration

As already said there is no answer. Assuming you can afford a peak transfer rate of 120 MB/sec via ethernet the requested time is related also on files' sizes. Personal account and apps apart, few bug file will be transferred faster than many little files. For example. Therefore lerform your migration with no hurry.

Depends how much you need to transfer and the speed of the connection. Could be 30 minutes or 180 minutes. Just depends.