Taking a break is often a good idea. Not only does it help you find typos and stuff, but leaving a piece "alone" for 24 hours helps you discover "flow problems" and other issues.
"Long form" articles are hard work. Whenever I write a 1000+ word post it tends to take at least 3-4 hours, from idea to publication.
So very true. Many professional writers I've read advise leaving your work alone for at least 24 hours. I think just taking a short break can benefit the editing process greatly. You just need to separate your mind from your work long enough to refocus it when returning.