30 minutes - 2 hours
MacBook Pro would no longer startup. Did troubleshooting and determined that the hard drive was the problem. Ordered a new one.
Using the fantastic iFixit guide, I EASILY replaced the hard drive, Installed OS X and was back up in no time.
Just make sure to keep the parts that you remove in order. Makes it much easier to put back together.
1 TB 5400 RPM 2.5" Hard Drive
T6 Torx Screwdriver
Phillips #00 Screwdriver