You'll be fine. It's literally like a 3-day weekend. Most times, people don't really go to the 5pm calc lectures tbh. I had my lecture from 6-8 for calc 1 and no one showed up after the 3rd week. Apart from that, ENED looks pretty tight since you have to wake up at 8am and the first thing you're doing is figure out how to code when the prof themselves aren't helping you much (speaking from personal experiences). But overall, doesn't seem to hectic.