The unsubstantiated rumors floating around suggest he's asking for 5 or 6 years at 5M+ per.
That being said, it fits in with the Flames' reaction to this whole thing - Zadorov says he wants to stay, his agent initiates contract talks only to be met with radio silence from Conroy. One would think that the Flames, perhaps more than most other organizations, would be dying to sign a 28 yo 6'6" truculent defenseman longterm. So the fact that they haven't, that Zadorov said that he wants to stay but "it's just business" strongly supports the idea that his contract demands are absurd for a #4/#5 defenseman.
But I don't think a lot of teams will care. That's an off season problem, they want him for this season.