Interesting - here my calculation
I did KB all the way. I am 512kb user upload and download for videophone. At finalized answer, then I use link to convert a true number from KB to GB. Here my work below...
512 kb x 60 seconds = 30,720 kb per minute (30 MB per minute)
30,720 kb x 60 minutes = 1,843,200 kb per hour (1843.2 MB or 1.843 GB)
1,843,200 kb x 5 hours = 9,216,000 kb per day (9.216 GB)
9,216,000 KB x 20 days = 184,320,000 kb (one month of business days)
Using convertion from this link
Byte Converter
184320000 kb = 175.78125 GB as my final answer...
Does that answer your question how I concluded my answer?
This is just an example of 100 hours of videophone a month at 512k. Now you are left with less than 71.22 GB to use for other things.
Now a question... if people use Roku Netflix, will they hit cap too? I dont have calculations for Netflix's roku instant watch streaming video to your TV. Videophone usage and Netflix instant watch will push you over the limit easily.