I don't know, it's showing most sites being pwnd in less than 20s with some taking just under 30s. Of course, that's on homeboy's local Mac. Not sure how long it takes to gain control with PHP2Shell to run the exploit though. Just started looking at that part myself
Everything i saw on twitter prior to the release turned out to be incorrect. At most people figured out it had something to do with session upload handler and UAF, but nobody knew what.