How many hours would it take me to drive there from Rhode island ave NW Washington DC ?

About 20 minutes heading towards NE Rhode Island Avenue. Turn from Rhode Island Ave NE onto South Dakota Ave NE via Baltimore Washington Pkwy. Once on BWI take Capital Plaza Exit which is Annapolis Rd. You will see Capital Plaza marquee as you turn. Walmart is located in the Caputal Plaza parking lot.

Google it, dear.

Sorry no idea. By driving, ride bus or metro?

Honestly, of the top of my head, I don't have an answer to your question, but I do believe you can get a pretty precise ETA to your destination using the Google maps app.