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
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