2 - 4 horas
It was not a problem per se, but more of o necessary upgrade. The kind of work I tend to get into requires more of a mid-level machine than a bigger one. I knew I could have a better performance but, alas, in Mexico some things are quite difficult to get.
I decided to give a step and things went better than expected.
After waiting exactly a week, the package arrived and I was sure no one in way several miles will have a computer as fast as mine (SSD & RAM upgrade).
I had seen stories about people having upgraded a Mini in half an hour, but in my case that did reduce to the half of time. I saw several times the tutorials and the manuals and did memorize it. When time came, it was like I had done it before.
FedEx arrived on time, parts came intact, no problem with Credit Card and the Self-Repair Manifesto hangs proudly in my door.
Research, research and read experiences. That will make the way quite straightforward.