One hex = 60 miles. Average walking speed is 3mph. Let's assume these are heroes and their average walking speed is 4mph. That means it takes 15 hours to cross 1 hex. Quick is 6mph. Slow is 3mph.
Traveling across Mokkden Caverns, Scorched Grove, swamp, or forest is difficult terrain, so double the travel time.
On a road per hex:
Slow/Stealth | 20 hours | ||
Average | 15 hours | ||
Quick | 10 hours | DC 15 Con (modified for weather) for a level of exhaustion. Failure by 10 or more means a second level of exhaustion. | Passive Perception is reduced. |
Very Quick | 8 hours | 1 level of exhaustion. DC 15 con (modified for weather) for a second level of exhaustion. Failure by 10 or more means a third level of exhaustion. | Passive Perception is greatly reduced. |