Assuming 8 hours, 4 hours per day, that's about 100 miles or 10 hexes.
Nagalore, the city with the quest item to do the ritual is 5 hexes away from Kir Sabal. So you have to go 10 hexes to get the flight spell.
So, if I'm mathing right and people aren't exerting for Exhaustion, if you decided...