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Nous écoutons le gong pendant une heure et demie pour la vibration intérieure.

Nous écoutons le gong pendant une heure et demie pour la vibration intérieure.
We listen to the gong for an hour and a half for the inner vibration.
From Lesson 404:Invariable adjectives before nouns (demi, nu)·French

Questions & Answers about Nous écoutons le gong pendant une heure et demie pour la vibration intérieure.

Why is demie spelled with an e here?
When demi comes after a noun (usually linked by et), it agrees with that noun's gender. Since heure is feminine, we add an e to make it demie. Note that it only ever agrees in gender, never in number, so it would still be demie even after a plural noun like deux heures.
How would the spelling change if we said "a half-hour" instead of "an hour and a half"?
If demi is placed before the noun, it is joined by a hyphen and remains completely invariable. Even though heure is feminine, "a half-hour" translates to une demi-heure without an extra e on demi.
I always want to say écouter au gong for "listen to the gong". Why is it just le gong here?
In French, the verb écouter already means "to listen to". It takes a direct object, so it does not require a preposition like à. You simply use the article directly after the verb: écouter le gong.
How can I remember that vibration is feminine, requiring the feminine adjective intérieure?
Almost all French nouns ending in -tion are feminine. Because vibration is feminine, the masculine adjective intérieur must take an extra e to agree with it, becoming intérieure.

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