Dc Visitor Map How To Get Norway Visitor Visa From US For Who Are On Visitor Visa In US?

How to get norway visitor visa from US for who are on visitor visa in US? - dc visitor map

Hello .... My parents are now the United States with a visitor visa and now want to return home from Norway to want to stay a week to visit my brother. I'm in Virginia .... I know I have to ask, Washington DC, but was curious what the process is and how long it lasts ...... would be very grateful if someone could help. ..

Thank you.