It's about three-fifths as long as a Basketball game.
In other words, 30 minutes is 0.625 times the length of a Basketball game, and the length of a Basketball game is 1.6 times that amount.(NBA regulation; playing time only)
It's about half as long as The Football game (American).
In other words, the length of The Football game (American) is 2 times 30 minutes.(a.k.a. American football) (per NFL rules; playing time only)
It's about two times as long as Louis-Antoine's reign.
In other words, the length of Louis-Antoine's reign is 0.5 times 30 minutes.(a.k.a. Louis-Antoine d'Artois, petit-fils de France, fils de France, duc d'Angoulême, a.k.a. Count of Marnes) (1830)
Following his father, Charles X's, abdication on the eve of the 1830 French Revolution, Louis-Antoine d'Artois was technically king for a period of approximately twenty minutes on August 2nd, 1830. Louis-Antoine's only official act as king was to abdicate the throne to his nephew, the Henri, the Duke of Bordeaux.
It's about two-and-a-half times as long as The First spacewalk.
In other words, the length of The First spacewalk is 0.4 times 30 minutes.(1965) (Alexi Lenovo, a.k.a. Алексе́й Архи́пович Лео́нов)
It's about one-third as long as a Football game (Association) (Soccer).
In other words, the length of a Football game (Association) (Soccer) is 3 times 30 minutes.(a.k.a. association football, a.k.a. soccer) (per FIFA rules; playing time only)
It's about one-tenth as long as Gone with the Wind (film).
In other words, 30 minutes is 0.132 times the length of Gone with the Wind (film), and the length of Gone with the Wind (film) is 7.58 times that amount.(1939)
It's about one-fifteenth as long as The First Indianapolis 500.
In other words, 30 minutes is 0.074602 times the length of The First Indianapolis 500, and the length of The First Indianapolis 500 is 13.404 times that amount.(a.k.a. Indy 500, a.k.a. International 500-Mile Sweepstakes Race) (1911) (Indianapolis, Indiana)
The first recorded automobile race of its distance, the inaugural Indianapolis 500 was won by Ray Harroun in 402.13 minutes. Haroun's average speed through the race was 120 kph (74.59 mph).