2 - 4 horas
Wanted to get the best Mac mini experience!
Installing the 2nd hard drive was quite easy, thanks to the great guide provided! I agree with the fellow fixer who said that it should have gone as far as reassembling the machine, but if you could follow all the steps without making any major mistakes, reassembling by going backwards through the steps is not a big deal.
I don't know why (maybe because mine was BTO), but one of the screws depicted in the guide was missing from my Mac mini. Not to worry, though: the process went smoothly nontheless.