I'm in FE, and FE interviews can be like this so much. "Here's a takehome for something that in reality would take a week to complete but do it in an hour and don't spend more time on that!"

And I'm like.. an hour is not long enough to implement any reasonable webapp... I have no idea if other people went over or not, and it almost feels like a test of commitment (if I was serious I would take the actual 4 hours it would take and pretend I did it in 1 or something like that).