Beijing punishes improvisation. It is not a city that rewards drifting, because it was never grown; it was drawn. In July 2024, at its session in New Delhi, the UNESCO World Heritage Committee inscribed the Beijing Central Axis on the World Heritage List, describing it as a building ensemble exhibiting the ideal order of the Chinese capital: fifteen components strung along one straight line that runs a little under eight kilometres, from the southern city gate to the Bell and Drum towers in the north. Almost everything a first-time visitor comes here to see sits on that line, or was deliberately placed off it.
That is the planning problem, and also its solution. Read the axis from south to north across your first three days, in the order the city was built to be entered. Then step off it, twice: west to the Summer Palace, north-east to the Great Wall. Do it the other way round and you will spend a morning on the Fifth Ring Road and then arrive at the Forbidden City with no idea what you are looking at.
How many days Beijing needs
Five. The Forbidden City alone absorbs three to four hours for its central halls and five to six if you add the side galleries. The Summer Palace is a separate half-to-full day a good fifteen kilometres north-west of the centre. The Great Wall is a full day out and back whichever section you choose. The hutongs, the Bell and Drum towers and the Temple of Heaven do not fit around those; they need daylight of their own.
At four days, something real gets cut, and it should be the Summer Palace rather than the Wall. At three, you are choosing between the palace and the Wall and seeing almost nothing of the living city in between, which is the part most people remember. At six or seven you can add the contemporary city out past the ring roads, which is genuinely worth a day if you have one.
Book the Forbidden City before you book anything else, because it constrains the whole trip. The Palace Museum sells its entire daily quota by real-name advance reservation and does not sell tickets at the gate on the day. Tickets for a given date typically go on sale seven days earlier, around eight in the evening Beijing time, and busy dates can clear within minutes. Reserve using the passport you will actually travel on, and carry that physical passport to the gate, because the document is scanned and a photograph of it will not pass.
Then note the other constraint: Monday is the day Beijing closes. The Palace Museum shuts on Mondays except on public holidays, and the ticketed monuments inside the Temple of Heaven and the halls inside the Summer Palace generally close then too, as does UCCA out in the 798 art district. If your trip contains a Monday, that is your Great Wall day. Deciding that one thing reorders everything below it.