1 - 2 hours
Installed a SSD to run OS off of, faster boot/load times.
The tear down was a lot easier than I thought it would be. I did have to do all the steps because the SSD was becoming the boot drive and the old Hard drive (1TB) is just for storage. The mini is mostly used as a server storage for my wife and I. Tho my son has started to play some games on it(Roblox, team fortress).
Read threw the tear down directions step by step before you start. Will make it all easier.