We have a USB620L attached to desktop computer with no other wireless connections the desktop the USB modem is attached to is networked to a 2nd desktop with internal network cards & hard wired (no WiFi). We do not do any gaming or use anything like Netflix and use the 2 computers only for email and limited Facebook and a few other sites. What might we expect our Data usage to be per month ? Both machines are Windows 7 with Outlook and Explorer.