If it's 1.5 hrs then the more important factor is how expensive are the tickets in relation to your income, I'm working with something similar and every two weeks is manageable.
Ever lived in a place where you can see some rooftops from your window and one day you see kids playing outside and throwing a ball, or a tennis shoe and it gets stuck on the roof. And it stays there for a long time, a year or more. If it's a slanted roof then maybe occasionally you see it has slid down a bit but got stuck at something again. And it bothers you so much that it's there. Today was a day when the tennis shoe finally disappeared!