Slightly reusing a thread, as I've read all the related ones and this seems the closest to my question.

I clearly have time to do make my own transfer (assuming no significant delays on the inbound), but was curious if you think I had time to grab some lunch, and if so where
Timing: Friday afternoon, just before Easter (Good Friday)
Arrive IAD @ 13:45 (A380 from London but I should be one of the first off)
Depart DCA @ 18:18 (to ORD)

Likely route: Take the 5A bus then the blue line metro (as long as times work, otherwise I'd be getting an Uber).

Presuming that I arrive and get through immigration promptly, where should I look to eat/relax - I was thinking to get some food around Rosslyn, or am I better off just eating around DCA/on the plane? Was also thinking to pop out and see the Pentagon briefly, again time dependent, but presume there isn't any food near it?

(I have done this transfer before, but I had a day between the flights. In that case I felt I got to DCA far too early and was bored in the airport.)

Thanks for any views