If you can avoid rush hours like others have said, but you never know with Hellanta. It can be horrible at 8am on Sunday if they are doing overnight construction, or a wreck. I advise using WAZE to get through the easiest pay. It will take traffic into consideration.
I live 30 miles south of ATL, and many times we end up heading to North GA through ATL on Friday afternoon with is the worst. Just get in the mindset that it may be bad, just pick a middle lane and go. Leave a good space, cause idiots will cut into any gap. Just be patient. You'll get through eventually.