I like to walk in 50 minute segments separated by a 5-10 minute break. I usually time the segments.
On a recent trip we would rest at the start of the climbs. When we set out again I would start my watch.
Over and over again the climb wold take right around 50 minutes. Even if we didn't top out, we would stop at a natural break point where the trail leveled out for a bit and sure enough, the watch would show right around fifty minutes.
It became a running joke......