I used to commute on Merritt Parkway for many years. It was much shorter distance from Westport, CT to White Plains/Purchase NY. It took me 30 min with no traffic and up to 2 hrs with a heavy traffic (at least once a month). From Westport to Newtown you have at least another 30 min. The traffic is very heavy between Bridgeport/Fairfield all the way to Stamford starting 7-7:30 AM at the latest. The reverse commute is very heavy starting at 5 PM. As a matter of fact, at least it is what I remember, the reverse commute is much more unpredictable and prone to delays. The solution? Drive to work early in the morning (leaving Newtown at 6 AM at the latest) and coming back late (after 6:30 PM or later). Possibly it changed, but from what I hear from my friends in the area - not much.