If it were only to take an hour then it's not a "comprehensive" exercise in the ability to solve problems as the OP desires.
It would then be an exercise with toy data that measures how smoothly the candidate conforms to the expectations of whatever framework they're using to solve hello-world-level problems.
It would then be an exercise with toy data that measures how smoothly the candidate conforms to the expectations of whatever framework they're using to solve hello-world-level problems.
"An hour" is a really short time!