Halftime in soccer is a defined interval, not a pause of convenient length. Four separate operations have to complete inside it, and none of them can be shortened much.
The players' half is nearly all travel
The interval must contain the walk to the dressing room and back. In a large stadium with a long tunnel, that consumes a noticeable share of the total.
What remains is short. Coaches plan a fixed sequence of medical checks, information and instruction because there is not enough time to improvise one.
Referees also use the interval, reviewing incidents with their assistants. They must be back on the field before the teams, which compresses their window further.
Broadcast inventory is sold against the window
Commercial breaks at halftime are sold in advance against a known duration. Shortening the interval would mean unsold or unaired inventory across every market carrying the match.
Studio coverage is built to the same length. Analysis segments are timed, and the return to the field has to land on the whistle rather than after it.
This is why interval length is written into competition regulations rather than left to the officials. It is a contractual quantity as much as a sporting one.
The crowd needs the time more than the players do
A large share of any crowd leaves its seat at halftime. Concourse capacity, restroom capacity and concession lines all have to absorb that movement in one burst.
Stadium designers size those facilities against the interval length. A shorter halftime would require more restrooms and more service points to deliver the same experience.
American venues face an identical constraint at every major sport, and it is one reason concourse design has changed more over recent decades than seating design.
Maintenance uses whatever is left
Grounds crews take the field for divot repair and, where permitted, watering. That work has to fit around whatever entertainment is scheduled on the field.
Where a halftime performance is planned, maintenance is squeezed or moved to the edges. The two uses compete directly for the same surface.
Crews rehearse this the same way changeover crews do, because the window admits no delay. Anything unfinished when the teams return is simply not done.
Why extending it is resisted
Proposals to lengthen halftime recur, usually on commercial grounds. They meet resistance because a longer interval measurably cools both the players and the crowd.
Players describe the difficulty of restarting after a long break, and medical staff point to the reheating that a longer interval requires.
The current length is therefore a negotiated compromise rather than a tradition. It is long enough for the operations and short enough that the second half resembles the first.

