So I can tell you I schedule my exams at the latest time possible, on the last day of every rolling Window (e.g. I took REG 3/10 for the 3/19 cutoff, BEC on 5/15 for the 5/27 cutoff — finsihing both about 5PM EST).
I always get my scores on release day. You're probably good with that 6 hour window. Hopefully I don't jinx you, or myself since I took AUD today. Good luck!