It actually took me about a about a year. However, the reason being was, I bought the motor while my Z was still running with the N/A motor. The LS1 motor sat in my my garage for like 6 months while I still researched more on the swap. I decided if I didnt go ahead and take the first step and take out the N/A motor, Then I would never get it done. So from the actual time it took from pulling the N/A motor to putting in the LS1 where it was drivable, it only took about 3 months.