I traveled 30+ hours journeys on train or bus, both usually non AC, bus even without toilet and I would take AC airplane with toilets anytime over these. You ca

I traveled 30+ hours journeys on train or bus, both usually non AC, bus even without toilet and I would take AC airplane with toilets anytime over these. You can walk in plane as much as in train, same narrow aisle, though with trains there is usually sleeper option for reasonable price (compared to plane) and leg space is usually a bit better even with seat vs seat. But still 20 hours ain't really that much, not even a full day.