[DanEC]

You could probably save them some time by prepping the car a little - removing hood and transmission tunnel before taking it in. With open accessibility they should reasonably have it out in 2 or 3 hours I would think To remove, prep and replace I think 8 hours is not unreasonable - but that might be a little tight for all the final adjustments and getting it up and running and in tune depending on if they run into any problems. I will go with 8 to 10 hours.