5 hours. We had air tools though. For the springs I bought spring compressors ($29.99 at my local auto part). That same day we also installed my Carbing front strut bar and the Midoris upper links. All that in less than 5 hours. We even wasted like 20 minutes running to a local hardware store 'cause we broke a bolt while torqueing it after installing the midoris. Nissan dealers are bastards. They charged me 2 hours once for installing SGP tension rods. And I even had to walk the "Master Mechanic" through the whole process. I dont even want to talk about alingment. I had to argue with the guy tha my car (a TwinTurbo) wa a 2 seater, not a 2+2. Anyways after that day I decided to start working on my car and never take it to a dealer.