Thanks, guys.
I usually get through this in anywhere from 80-95 minutes depending on how frisky I am on any given day (sometimes longer if I'm really knackered, but never more than 2 hours).
I also roll for 12 weeks at a time, then a week (maybe 2 if recovery needs dictate) entirely off, and will take a deload week (or 2) within each 12 week cycle if the body says so (otherwise not) - generally it says yes, and I've found that, because of my age, it's best to listen; recovery can be a challenge at my age