SortStack #3315 — 2035-07-07

By duration · Order from shortest to longest.

1. An amber traffic light before it turns red 4 sec

   Amber phases are tuned to road speed — typically 3 seconds in town and up to 6 on fast roads, calculated from braking distance physics.

2. The elevator ride up the Burj Khalifa's observation deck 1 min

   The lifts climb at around 10 metres per second. Your ears pop on the way to the 124th floor — the building is so tall it has distinct climate zones.

3. The Battle of Leipzig, Napoleon's 'Battle of the Nations' 4 days

   With around 600,000 soldiers from over a dozen nations, the 1813 clash was Europe's largest battle until the First World War.

4. A full-term human pregnancy 280 days

   Only about 4% of babies arrive on their due date — and the classic count starts from before conception even happens.

5. The Second World War 6 years

   From the invasion of Poland to Japan's surrender, it remains history's deadliest conflict — fighting officially ended on a battleship in Tokyo Bay.

6. The Romanov dynasty's rule over Russia 304 years

   It began with a 16-year-old reluctantly accepting the throne in 1613 and ended 304 years later with Nicholas II's abdication in 1917.

← All puzzles · Play today’s SortStack