Originally Posted by gregf83

Not really. If you tell me you rode 17 hrs in a week that says nothing about how hard you rode or what the stress on your system would be. That could be a weeks worth of Z1/2 easy base training or, as in your case, a higher percentage of Z3/4 efforts.

Have a look at your annual training stats. I suspect your avg speed doesn't vary much from year to year.

They are never written based on time only. Like I said, without intensity, time is equally useless as a measure of training stress.