Plan to spend 2–3 hours at the Churchill War Rooms to explore the underground Cabinet War Rooms, follow the complimentary audio guide, and discover the interactive Churchill Museum. If you're short on time, 60–90 minutes is enough to cover the highlights. For a more immersive experience, allow 3–4 hours, especially if you've booked a ticket that includes a guided walking tour of Westminster, where you'll uncover Churchill's wartime London before or after your visit to the museum. Since the attraction is self-guided, you can explore at your own pace.