27 July-31 August 2013: Open daily 09:30-19:00 (last admission 16:45)
1-29 September 2013: Open daily 09:30-18:30 (last admission 15:45)
Buckingham Palace operates a timed-ticket system, with admission every 15 minutes throughout the day. Tickets are valid only on the date and at the entrance time specified on the ticket. Regrettably, late-comers cannot be admitted.
A visit lasts between 2 and 2.5 hours.