Border stamp (Borderан) – valid for 45 days. Tourist visa (Визаран) – valid for 90 days, but a same-day return trip requires using visa agents; otherwise you must stay in another country and wait for visa approval.
Vietnam Border Stamp & Visa Duration Guide – Border Pass 45 Days, Tourist Visa 90 Days
Border stamp (Borderан) – valid for 45 days. Tourist visa (Визаран) – valid for 90 days, but a same-day return trip requires using visa agents; otherwise you must stay in another country and wait for visa approval.