There are 18 holes in a round of golf.
Normally 18 holes are played in a round of golf.
When you say: "I have just completed a round of golf." Generally you are saying that you have just played golf. Usually 9 or 18 holes. I don't think it matters how many holes you play.
A round of Golf is usually 18 holes. But if there is a match which is still a tie after the stipulated round, playoff holes can be played until the match is settled, there is no limit to how many holes are played, unless settled by the competition committee.
There are 18 holes in golf. There are the front 9 and the back 9.
There are usually 18 holes in a golf course; some have 9 holes or some multiplier of 9 holes. I have played at golf clubs with 9, 18, 27 and 36 holes. However, a standard "round of golf" at most golf clubs / courses involves 18 holes.
There are 18 holes normally played in a game of golf.
The number of holes at a course may vary. Some have just 9 holes while others may have 18,27,36 or more. A true "round" however, is played on 18 holes.
Some golf resort have different golf course, depends on the golf area. In one round there are 9 standard holes.
72 holes, 4 rounds of 18.