Still getting free map updates after 60 days.
After owning the car for 60 days I have successfully updated the TomTom maps from v10.851 to 10.852 (Australia map).
This included an update to the Tom Tom application on the SD card; a largish map update (200mb) and about 10 map quick fix/corrections (very small).
After the latest versions of TomTom and maps are copied to the SD card, the Tom Tom Home application on my laptop instructed me to put the SD card back into the car, switch on the NAV function. This process reloads the new TomTom software and maps to the car's NAV unit (about 2-3 minutes) and reboots the NAV system.
All good!
I will try again in month's time to see how long before the free map updates cease.