Phew, I'm glad someone volunteered before I started offering payments and stock options in a fictitious company.
9PM MST (4.5 hours from right now) seems to be a safe time to grab it, though anytime between 6PM MST (1.5 hours) and 12AM MST (7.5 hours) should all be the same update. That's usually after the last update of the day, and before they roll over for the new day. If you miss a day on pie, don't worry. I've done that and its no biggie, just record the current day's top 10 with a screen cap.
“If you don't dip your words in sugar, rainbows and teddy bears people will think you wish to hunt them down to torture and eventually kill them.” -DanTheBanjoman