Some similar katas already exist, nothing new or fancy here. And if you DO want to publish a kata, you need to work on description:

• Just give an example order and explain what each field means.
• What kind of workingHours can we expect to get? If it's only X days, why not use int instead of string?
• Can Joni work 24 hours a day?
• Expected return is true / false, not 'truth' / 'lie'.

Most of this stuff needs to be explained in description.

Surely a duplicate, and not a novel one at that. Also, no random tests.

I recommend to add random tests, because that can avoid solutions with all iteration results.