We drove 1926 miles in Ireland. That was over 16.5 days (average 116.7 mi/day).
One day that we climbed to several fortified ringforts, my Fitbit recorded that I climbed 169 flights of stairs. My phone recorded that I climbed a mere 14 that same day. The fact that, as I understand it, the Fitbit counts 8.5 feet as a flight, and the phone uses 10 feet doesn’t account for that discrepancy. And I don’t think either was close to accurate.