This one is fine!. The sentence with "don't" is missing from the translations, so I'll add it. But the version in your first comment falls into the "not quite English" category. :-)
Actually, the system should have recognized an answer containing "don't" even though it was not a manually-added translation. Would you mind letting me know if you actually answered "They don't want to wait any longer" for this exercise, or if you were just asking if that would be accepted? Thanks!
No BHBass I did not wrote this answer ("don't want ... any longer"). Should I try it on purpose, BHBass? I was just curious and the "any longer" sounded nice to me. Next time I'll try duo's version with "don't" too. (and will let you know if it should not pass).