Regional Pass - seems to often add more time to the trip. Is this right?

Hello,

I have been mapping our travels to see if it makes sense to purchase a regional pass. When I use Navitime and select the pass we are considering, the option using that pass often takes much longer. We would be saving some $ using the pass but don't want to add hours to some of our trips. Does this sound right? Is this the best way to figure this out? Any guidance would be appreciated.