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I agree with the 4-minute time limit for all 100 turns. For a tournament with such noble goals, the time shouldn't prevent participants from showcasing strong gameplay. I tried single-player on this save (only with Castle) and there wasn't enough time to think; I had to load autosaves.
Big respect for the tournament, but if you find the strength to hold another one, the time should definitely be increased to 6 minutes.
P.S. When I started playing online a year ago, 4 minutes was enough :) What could be the reason for this? :D
When playing as Castle, I had a minimum of 2 minutes remaining at the end of each turn, and the map wasn't very dense – there wasn't much to do.
P.S. Maybe I'm just not thinking?! (but I easily took the third Utopia).