Are we talking about the "limit" of draft time? Or the average time it should take for captains to pick?
If you consider the fact that each pick/ban took more than good 5 to 10 minutes (and then some) in past tournament, 30 seconds "Limit" seem far fetched. Even if each player has an idea or two of what heroes he/she wants, it would still take longer than 30 seconds to communicate.
I'm all for 30 seconds per pick as much as the next guy, but I don't feel 30 second should be the Limit. Everything would be speed pick, and rushed.