1 - 2 horas
My Ps3 fat 40gb finally YLOD'd after having it a couple years (and having bought it used as well)
I was very intimidated by the looks of the process. But once I got started, it became clear how straight forward it really was. Took me about an hour and a half to completely finish (mostly because I forgot to put the PRAM battery back in, I had to partially disassemble the system again).
The process difficulty will seem like a 9 out of 10...
The process difficulty when you do it (as long as you have SOME technical experience, at least common sense) is just a 5 out if 10