I think in the following sentence, alle should be replaced with jede:
Diese Busse fahren alle fünfzehn Minuten vom Hauptbahnhof ab.
It means that the buses leave every fifteen minutes, doesn't it? Are both correct? Do they mean exactly the same?
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You use alle for "15 minutes" because "minutes" is plural. You would use jede for singulars, like jede halbe Stunde. You could not use them vice-versa.
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1IMHO there's almost no difference between "alle halbe Stunde" and "alle dreißig Minuten". And i doubt whether this is colloquial - i can't think of a situation where this phrase would be inappropriate (maybe simply because i can't think of an alternative ;) ). – tohuwawohu Oct 1 '11 at 13:19
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"Alle halbe Stunde" sounds wrong to me, I would say "jede halbe Stunde" or "alle halben Stunden". – Phira Oct 3 '11 at 13:52
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2"alle halbe Stunde" does not sound wrong at all to this native German. But it is col. :-) – Florenz Kley Oct 8 '11 at 14:14
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I think it is something like a fixed term.
dwds says
alle bezeichnet den wiederkehrenden Wechsel; immer wieder nach
alle halbe(n), alle (drei) Stunden
mitteldeutsch aller
aller fünf Minuten, zwei Jahre, drei Schritt
