-minütig
-minute
Used as a suffix in combination with a number to indicate the duration of something in minutes.
Nach einer zwanzigminütigen Präsentation gab es Zeit für Fragen.
After a twenty-minute presentation, there was time for questions.

-minute
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-minute
Used as a suffix in combination with a number to indicate the duration of something in minutes.
Nach einer zwanzigminütigen Präsentation gab es Zeit für Fragen.
After a twenty-minute presentation, there was time for questions.

The word '-minütig' (-minute) is always combined with a number and written together as a single word. It functions like a suffix to indicate a duration in minutes.
Der Film hat eine zehnminütige Pause.
The film has a ten-minute break.
This adjective almost always comes directly before a noun and is declined like any other adjective. It describes the duration of the noun.
Ein dreiminütiger Werbespot unterbrach die Sendung.
A three-minute commercial interrupted the show.
Common nouns combined with '-minütig' (-minute) are those that have a time span. Typical examples are: eine ...minütige Fahrt (a ...-minute trip/ride), Pause (break), Rede (speech), Wartezeit (waiting time), or ein ...minütiges Gespräch (a ...-minute conversation).
Die einstündige Verspätung führte zu einer nur noch fünfminütigen Umsteigezeit.
The one-hour delay resulted in only a five-minute transfer time.
minutes-long
'-minütig' and 'minutenlang' both describe a duration in minutes, but they work differently. '-minütig' is almost always used with a number and forms an adjective, for example 'zehnminütig' (ten-minute) or 'fünfminütig' (five-minute). It says exactly how many minutes something lasts. 'minutenlang' does not give an exact number. It only means that something lasts for several minutes, often longer than expected or noticeably long. Learners may confuse the words because both have to do with minutes. The practical difference is: with an exact number, use '-minütig'; without an exact number, use 'minutenlang'.

Nach der Arbeit haben wir eine zehnminütige Besprechung im Flur gehabt.
After work, we had a ten-minute meeting in the hallway.
In der Pause hat sie minutenlang auf eine Antwort gewartet.
During the break, she waited for minutes for a reply.