phonso (correct)

[lapis cedar]

Please be patient

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[sour flame]

that would be « il leur faut »

« Il leur faut beaucoup de temps pour compléter cet exercice. »
-# ("They need a lot of time to complete this exercise.")

[vapid crater]

« falloir » is an impersonal, it doesn’t refer to a specific subject. « Il faut » can be translated as ‘They need’ but its most apt translation is, ‘It’s necessary’.
There exists a construction for this: « Il faut qqch à qqn » which literally is, It’s necessary (to have/do) something for someone’ or more figuratively, ‘Someone needs to do something’