for reference, 20 miles:

summer time, road bike, 25mm tires, 90 minutes, approx 13mph

winter nite ride in strong wind on a hybrid (bike alone is 10 lbs heavier than the rd bike) 55mm tires, loaded w/ 3 light heads, 2 on bars 1 on helmet, plus batteries for all & I was wearing larger, fuzzier clothing. 120 minutes, approx 10mph (no computer used only phone snapshots of the weather, so super inaccurate) so yeah, lots of wind resistance compared to a 1/2 naked, lighter summer road bike w/ no extra wind parachutes strapped to the bike