It is relevant, though. I have 1.2 Gbps down with a 2 TB monthly cap. I've never hit the monthly cap even once, but by your standard I have "1.2 Gbps down for 3 hours, 42 minutes".

But that doesn't change the reality that it matters to me that a 20 GB video that a friend took at my wedding downloads in just 2 minutes rather than the ~30 minutes it would take if I had a 100 Mbps connection.

Right, but 3+ hours of top speed per month is a lot, 80 seconds isn't.

Your cap is over 150 times that equivalent. If you had an 80 second hard cap, you couldn't even download that 20GB video.