Anyone know how long it takes for the car to adjust (ACTUALLY MOVE) when setting the calibration values?

Mine doesn't seem to move at all and now the car is warning me the "Air suspension is not in Customer Mode"

It should move within seconds of being told to upload the new values.
However, I'm not sure if it will move at all if you're making adjustments of less than 10mm - as that's within the normally permitted tolerance.
If so, you'd need to request Access Mode or Off-road height to make it move & then bring it back to Standard height Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

I managed to get it to adjust ever so slightly by adjusting the values (no movement) then deflating the bags and rebuilding.

The tool is a little flaky it seems.

I definitely think I’ll deflate the bags when I change the suspension arms, will mean I don’t have to jack the car up so far.