I have 65 minutes connection time, arriving from PDX to IAH in C terminal at 6:55 pm and departing to GIG (Rio de Janeiro, Brazil) from E gates at 8:00 pm. I am considering walking rather than taking train from terminal C to D and walk to E, to save time. Is it possible to walk from Gate C45, the last gate in C terminal to Gate E1? If so, how long is the walk? Is it better to walk from C to E or take train? Thank you for any suggestions.