Hi,
I use (the awesome) NetScan regularly
On average, I'd scan a range of ~150 addresses continuously (via Live Display) and might run another 10 one-off scans of ~10 addresses throughout the week.
I was surprised to see NetScan has amassed over 25GB of data usage in the Windows 10 30-day data usage overview, far outstripping the rest of my apps combined.
Does this seem right to you?