The standard number of holes on a full-length golf course is eighteen. This established convention dictates the structure of professional tournaments, amateur play, and the design of golfing facilities worldwide. It represents a complete round of golf, typically taking around four hours to complete.
The adoption of this specific number is attributed to the Old Course at St Andrews in Scotland. Initially, the course comprised eleven holes played in a line out from the clubhouse, then the same eleven holes played back in. Over time, some holes were combined, eventually resulting in a layout of eighteen distinct holes. This format proved popular and was gradually adopted by other golf clubs, solidifying its position as the norm. A complete course offers a suitable test of skill, endurance, and strategic decision-making for players.