One and a half (anderhalf, anderhalve)

To say "one and a half" in Dutch, use anderhalf. It is always followed by a singular noun.

When the noun is a het-word (like uur), use the basic form anderhalf.

The band's rehearsal lasts one and a half hours.
De repetitie van de band duurt anderhalf uur.
We have been waiting for the drummer for one and a half hours!
Wij wachten al anderhalf uur op de drummer!

When used with a de-word (like week or maand), add an -e: anderhalve. The noun still remains singular.

The bass player searched for the amplifier for one and a half weeks.
De bassist heeft anderhalve week naar de versterker gezocht.
We have been practicing this solo for one and a half months.
Wij zijn deze solo al anderhalve maand aan het instuderen.

Notice how the gender of time units like minuut (de) and uur (het) determines the correct form:

The volume of the drum kit has been too soft for one and a half hours.
Het volume van het drumstel is al anderhalf uur te zacht.
We change the volume after one and a half minutes.
Wij veranderen het volume na anderhalve minuut.

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