Rhythm Thief said:
...Dervla Murphy went over the Pyrenees - or somewhere like - on an old Raleigh with Sturmey Archer 3 speed gears....
Dervla Murphy went all the way to India (from Ireland) on an old Raleigh (it wasn't old at the time, of course) with a 3-speed Sturmey Archer because she had no mechanical knowhow whatsoever (her confession) and didn't think she would be able to rely on derailleur gears for the several thousands of miles involved.
About 20 years after her trip, I followed in her wheel tracks through Pakistan, and the 'roads' were still unbelievably bad. Often donkey tracks had been widened so it was just about possible to get a jeep through with help from the locals who would pick it up and carry it over the bad bits. I wimped out by used a touring mountain bike kitted out with 21speed gears.
But if Dervla could do her trip on her Raleigh, I don't see why 80 miles (I assume) on a modern hybrid would be an insurmountable challenge for a fit person.