It is a 40 mile total run, making a number of stops along the way. The more people it has to serve, the less convenient it becomes.
The other line (running from downtown to the airport) was also a total of 1 hour 30ish minutes including bus from my house to the terminal, then rail down to the airport. It otherwise was a 30ish minute drive, tops, and driving is what almost everyone chose to do if they had the car to do so.
That would be ridiculous, if it would up to 1 hour round trip it maybe would be more effective.