"Nusu saa"

Translation: Half an hour

[EdwardThor2]

"a half hour" should be accepted

[AGreatUserName]

Yep, I'm guessing the creators of the course weren't as familiar with this phrasing (it sounds distinctly American to me - Kenyan English has more in common with British and other Commonwealth English dialects). Maybe one day someone will process all the reports.

[ElladuJapo]

half hour is wrong?