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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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As '09:00' is the lower possible limit, it's the answer for several tests, so it's impossible to say which one of those you erred upon. You can always add some console logs to the top of your code to check though:
console.log("schedules", schedules);
console.log("duration", duration);
Passed all test case except "'17:00' should equal '09:00'",which possible test case could this be