IPA: /ˈoʊvərlɔŋ/
KK: /ˈoʊvərlɔŋ/
Something that is excessively long or longer than necessary.
The movie was overlong, making it hard to stay focused until the end.
For a period of time that is longer than necessary or desirable.
The meeting went on overlong, causing everyone to feel tired and restless.
Overlong → It is formed from "over-" (meaning excessively or too much) and "long" (from Old English "lang", meaning having a great length). The word "overlong" means excessively long or longer than usual.
Think of something that is 'too much' ('over-') in length — that's why overlong means excessively long.