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it took me about an hour to get mine out and the new ones back in that was with reading the directions and taking out the sparkplugs lol and since then I've had to take one side down and put it back up and that took less than an hour with the maintaince I had to do under there but just for your info if you have the Z51 watch out for tranny cooler lines running by the passanger side and it can rub on the header and cause you more work as I found out the hard way lol.
the install is pretty straight forward, I found the most difficult part to be lifiting the car... other than that it's really simple. I think total time for me including installing a new tunnel plate and thermostat was about six hours or so. I could have done it in less but I wasn't really in a hurry and did most of it myself.