Schedule discovery, small amount of time, SCCM

It's been quite a while when i really test new sccm client RE-installation process.
How fast i can re-check that new client is really installed?
How fast i can see the new updates is coming based on collection selected?

When reinstalling system i think the first rule is to remove old computer object from sccm console:

This will let the sccm manager load the new computer object with new ID :)

It is quite useful to set System discovery to 5 minutes or less:

Also check the time for each collection created: