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From the Tesla website
How long will the FSD Computer installation take?
The installation process will typically take about an hour to complete but may take longer depending on your configuration.

Mine took 3 days, one day of hardware and two days of software installation
April 2017 Build MX
AP2 to FSD and MCU1 to MCU2
 
From the Tesla website
How long will the FSD Computer installation take?
The installation process will typically take about an hour to complete but may take longer depending on your configuration.

Mine took 3 days, one day of hardware and two days of software installation
April 2017 Build MX
AP2 to FSD and MCU1 to MCU2

You misunderstood. Day 1, you dropped off your MX. They didn't look at it yet, they just staged it.

Day 2, they performed the physical installation from 800 to 8:30am. However, they need to recalibrate your car but that needed a special tech who lives in Anchorage. It took 12 hours to fly him in.

Once in, he had 476 cars to look at. So on Day 3, yours was #470 in line. He completed the software calibration in 30 minutes once he got to your car. Completing the installation within one total working hour.

Hope that clarifies for you..