Hi Carey,
At the rec center that I go to, all of the machines are set for a maximum of 60 minutes. However, when the treadmill counts down and then blinks END, I hit the quickstart button and it continues with my mileage and calories burned. I have gone beyond 100 minutes. The only bad part is that when it gets past 100 minutes, it quits counting seconds, but at least it keeps going. I'm drawing a blank on the brand of treadmill but I know that it is not a Nordic track.
I agree that a local gym might know. Salespeople at a specialty running store may also know.
Good luck and happy running!:)
Ang