Dracade is right it would be immediate. Thor can definitely swing/throw mjolnir faster than light and Thor's own super speed is at least close to light speed (some will argue he moves at FTL speeds). Batman dies as soon as Thor wills it.
I agree with everything you said in your blog. The one point I would make is that Rulk should be able to beat Savage Hulk with cunning, but he tries to beat Hulk in a stand up fight out of arrogance and ends up getting smashed.
I realize the Venom symbiote has been effectively lobotomized, but that probably won't last too long so my question is this: it seemed like Carnage had regrown Cletus' legs in the Minimum Carnage crossover (not to mention recovering from full decapitation immediately) so do you think that Venom would regrow Flash's legs if they ever permanently bonded? It seems like this could be a pretty great motivator if they ever wanted to make Flash completely cross over to the dark side.