I think it should be a 1 tick event, both from a personal perspective but also from a larger perspective. The idea of CE has always been to bring the best players together, bring back the old players and have an epic era. Now, I won't argue about the current state since I think that'd turn into a massive argument, but it's simple fact that the consensus is that the best players used to be found on 1 tick rounds. More specifically, the best eras historically used to be on Earth 1 (hence having CE on Earth, as a 1 tick).
Many of those old teams that you want to bring back for a CE and that have been brought back on past eras such as GML and ARM are 1 tick players, not to mention that I'd argue a large percentage of those mentioned in the dream team thread are 1 tick players.
Also this, very much.
Actually.. Closer to 7 months. The fact that you could hardly catch your opponents sleeping adds a very important element to the game in my opinion, strategy and diplo rather than just activity. Following your line of reasoning you might as well play it as a 6 tick round.
I can see an event being organised on a 2 tick round that'd be a sort of 2 tick champions round, but the true "flagship world" has always been E1, the original rounds were 1 tick, and practically all the great eras and players looked back on are 1 tick worlds and players. So I do not think it would make sense to make the 2 Champions Era 2 tick, it would be ideal for a smaller percentage of the players than 1 tick would be.