Garry Bargsley gives an example of how quickly you can migrate a SQL Server instance:
So in just 1 minute and 34 seconds you have migrated all of the following from one server to another.
All SP_Configure settings
Any Custom Error Messages
Any SQL Credentials
All Linked Servers
Database Mail along with Configuration and Profiles and Accounts
All user objects in System Databases
All Backup Devices
Any System Triggers
All User Databases
All Logins
Any Data collectors
Any Security Audits
All Endpoints, Policy Management, Resource Governor, Extended Events
And Finally All SQL Server Agent Jobs, Schedules, Operators, Alerts
These are probably very small databases (as it was a test instance), but dbatools is quite impressive.