Sorry I should specify this is a weekday, so 4:20 p.m. I would leave have to be there at 5:00 p.m. this would be Tuesdays and Thursdays

Is this today or a weekday? Today should be no problem. I’d say max 30 minutes, even with a little traffic.

Leaving from the parkway next to south run rec center at about 4:20 p.m. and have to be in Chantilly by 5:00. Is 40 mins enough time? I am only briefly on 66 to get off on the Dulles exit off the parkway so I'm hoping that won't be too terrible. I have to be off of Willard Road. Do I have any hope of doing this and being on time?