I would not chance at all allowing two hours. As pp, you probably will hit some form of traffic, allow to walk over to terminal/security, give time to get through security, tram it over to the gate, get to the gate and board. TOO much rushing/stress. I think we all have seen the lines at security and they can back up and be slow. Although we have been lucky and have waited no more than 15-20 minutes that it not a chance I would want to take.
You also will start boarding at least 20 minutes earlier than your 6:00 departure time.