said by Arthur Winsl :
Every modem on the Rogers docsis network has a 10485760 byte burst appended to the downstream service modulation.
Thats a good technical explanation of whats not happening.
It's 100% for sure by time and not data.
said by JMCD23:
I think 10MB might be accurate for the former 10mbps tier, because that's about how long it would be effective for. I can say that on my 32 mbps tier I see about 5MB-6MB/sec for around 10 seconds and then it drops back to 4MB/sec.
Thats exactly right. By observation/calculation we can tell its much more than 10MB (50-60MB for you).