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It’s good to see that even fans of Heroes 4 acknowledge that the quality of turns is higher in Heroes 6.
On the other hand, I know that some of them still play without animation speed-up, which unnecessarily prolongs the game. So, let's all enable the speed-up:)
In tournaments, 6 minutes is definitely the standard, as I've mentioned many times.
To be honest, I don't think it's worth increasing it to 8 minutes yet. I usually manage with 6 minutes because I think through my actions during my opponent's turn. But we could consider adding a couple of extra 6-minute intervals per game, if needed. That is, allow two additional 6-minute periods. And, for example, let the player say they're taking extra time and use their auto-save.