I can't find a thread. And this is the first time I've flown out of the DC area.

I have a flight at 18:45 tomorrow DCA-EWR and I have an event at the national press club (529 14th ST, NW) which is suppose to finish at 17:00.

At that time how long should a taxi to DCA take. What is the latest I can arrive at DCA?

I have TSA pre and no checked bags.