I beleive it to be 5:08 because A golden cookie can only spawn after 5 minutes and even if you get a click frenzy, and by some miracle you already have all 3 early game clicking upgrades, it would take 160 clicks to get 1 million cookies, and any less than 8 seconds would require you to click over 20 times per second for multiple seconds straight!

Isn't that already a rule?