Bottom line ia split up the dosage. It doesn't have to be exactly 8 hours. That's splitting hairs as someone else stated in a different thread.
A note remember - 2 half life's and you still have 25% left in your system. A lot of people think after 2 half life's, the compound is out of your system. Even after 24 hours or so (say 3 half life of Anadrol), you still have 12.5% left in your system. It will vary from person to person, mainly based on metabolism.
Protein synthesis(among a bunch of other benefits) is better with Anadrol and food is more important than the workout itself imo. So splitting up the dosage let's you get the most from the compound, keeping a more steady release of Anadrol in your system. Whether it be 6, ,7, or 8 hours doesn't matter too much. Just be in that range!!