Not just “not often”, but never, as data is sent to the app via Bluetooth. This is a big plus for me because I am mostly just capturing the data for later review, not for real-time monitoring.
The no-insurance, out-of-pocket cost here in Seattle for the Libre 3 is less than $40 – the same I previously paid for the Libre 1, but this of course depends on your location and moon phase etc.