it takes about 15 minutes to WALK a mile.
Average walking pace is 3 miles per hour, so the answer is 20 minutes
It would take about 2 days to travel by horse 50 miles so it would take about 4 days to walk it.
It just depends: How fit you are, how fast you're walking, and where are you walking (uphill, downhill, etc.)
It all depends on your speed age and level of fitness The average human walks at 3mph, 25 miles /3 mph = 8.33 hours