But I would scroll 500 miles

Let’s say a 6 inch tall screen. Averaging 1 screen every 10 seconds.

That’s about 3 ft/min

5280 ft/mi. ÷ 3 ft/min = 1760 min./mi.

1760 min./mi. ÷ 60 min./hr ≈ 30 hrs./mi.

16 hrs/day * 365 days/yr. = 5840 hrs/yr

5840 hrs/yr ÷ 30 hrs/ mi ≈ 200 mi./yr.

If I got my unit conversions right, that’s about 200 miles per year… unless you scroll in your sleep, then it’s like 300 miles.

Zero, I scroll with my index finger.

It would likely depend on the width of your screen depending on how post feeds are rendered in your Lemmy client.