@Rhishav its usually between 10-30TB and my average for past 6 months is around 18TB/month.
Speeds are dependent on regions routings and the IP you're assigned to. Somedays you get great speeds to all regions and some other days its practically dsl. But i get around this problem by changing the IP when i notice there is a issue (which happens a lot less now compared to before ). Also i get pretty good speeds anywhere from 400-900 mbps to couple of
PIA VPN servers so most of my mission critical applications are routed using that Indian server for better routing or european servers for applications that need more bandwidth. once you figure out your setup and solve its problems its good as it gets.
I'm locked in with my old pricing when i first brought the connection or the recent price hikes didn't affect me so i paid 21.9k for 21 months