Forever

"I think that actually happens alot when one character takes on several. If they didn't scale back certain characters then the fight wouldn't last past the first panel. Sadly battles like that are a way to showcase one character, while kinda sh!tting on the others involved. There's an issue of JLA where Wonder Woman is blind yet still beats down Black Canary, Plastic Man, Flash, Batman, and Green Arrow......at the same time. It was meant to show just how dangerous Wonder Woman really is, that even though she's blind she can still handle the likes of (insert characters here). But while doing so, it totaly undermines the abilties of the other characters involved."

The only way Bullseye would have a chance is if Batman didnt have his utility belt.  As has been mentioned, Batman has several things in his belt that he could use to take Bullseye out without even hitting Bullseye.  Add to that the fact that Batman is as agile as characters who routinely dodge Bullseye's attacks and it is a certainty that Batman would have enough time to use one of those tools.

He's seen better days.

I have to lean towards Martian Manhunter but I would like to see more examples of all of their less used powers.  I dont see enough of them using their super speed for one.  Superman holds back so often that people without super speed get to him repeatedly so I dont know if his top speed is any better then Manhunter's or not.  Simply going off of what DC claims about their powers and what has been shown of them, you would have to lean towards Manhunter.

Without having read all of the books I'm going to have to agree with Gambler.  From what I've seen, he should be able to kill them all easily.

"Seeing how  pretty much everything in the Marvel Universe was affected by the virus in Stark tech, it would seem that Tony is earning more on patents and licensing.  WayneTech may be busy but Bruce seems more focused as Batman and trying to secretly fund his private projects.  Tony is more open about what he's building.  Think about how much of his tech is used to build one helicarrier.  Each time they build one, he's getting royalties over the use of his tech.  Since Stane Enterprises isn't much of a force anymore, it doesn't seem like there's too much competition.  And having the CEO be a member of the Avengers, that's gotta put some faith in the company among stockholders and consumers.  In the DC Uninverse, Lexcorp is a fierec competitor of WayneTech.

I say Tony."

I never seem to see any of this drama, but welcome back.

"because he stated he had trouble with Kyle Rayner in Marvel/DC and I'm pretty sure Supreme has some kind of magic ability"

"Prime has the advantage with the magic even the PC Superman wasn't as resistant to magic (as far as I know) as Prime is plus Prime's insanity and determination has made him go and do things I don't think any Superman or Superman like character can do. I give Silver Sufer runner up ,because I believe his use of the power cosmic give him an nearly unlimited amount of energy to do with as he pleases for an attack. The only reason I put Prime ahead of SS is do to the fact I feel anyone that can beat down on a Ion possessed Daxamite can pretty much beat anyone."