for ... minutes; a period of ... minutes
Counter suffix used after a number to express a duration measured in minutes. It emphasizes the length of time, e.g. 5分間 means 'for five minutes' or 'a five-minute period.'
ここで10分間待ってください。
Please wait here for ten minutes.
会議は30分間続いた。
The meeting lasted for thirty minutes.
I waited in front of the station for ten minutes.
This test has to be finished within thirty minutes.
Written with 分, used for minutes, plus 間, meaning an interval or span. This is a transparent compound spelling for a period of minutes rather than a separate historical derivation claim.