Typically 250-500 per hour depending on the gear and the skills of the colorist. Hard to say how long it would take- depends on how much work is fixing vs. creative and how long you want to experiment, etc. I bet you could get away with 2 or 3 hours.
The DR Group....ask for TJ. GREAT colorist. He uses COLOR to color correct. http://www.thedrgroup.com/
Filmlook...Ask for Robert. http://www.filmlook.com/ The colorist there (forgetting his name...BAD Shane) is also amazing. They use a DaVinci.