The k2 special line is an express bus service from Beijing to Capital International Airport. The time from the city to the hotel is approximately 40 minutes to 1 hour, depending on traffic conditions and specific routes. If you go directly from the city to the hotel, the time is usually shorter; if you need to transfer midway, the time may be longer. It is recommended to check the specific timetable and route information before traveling to obtain the most accurate estimated time of arrival.