I can't speak for an employer but as a potential interviewee I had to try and build a web scraper which confused me, got it eventually but didn't cut it and between that I'm a fulltime parent so doing this around my daughter was a nightmare..
It's good to test but sometimes I wonder If they are asking too much for the developer and nerves also come to show. I've not done a terminal app but I would image would take the same time or more, call it at five days would think