5 - 30 minutos
Ran out of space on my 250 GB macbook pro. Upgraded to a 750 GB drive.
Went very well. The guides were great.
When taking off the HD bracket, lift it straight up. It's not a lever, it comes all the way off. Also, when putting the screws back into the case, angle them slightly outward to get them to start correctly. First boot after the fix takes longer than normal.