As I still have a ways to go in the game in terms of levels, I still get Colosseum events for dragon elements I don't yet have. In some cases (Metal) I'd like to just do it and get it over with. In others (Air) I might breed one relatively quickly and then start it. If I leave the Colosseum event indefinitely will the element ever change? If so, how long does that take?
I think that the event in the Colosseum event changes every 24hrs. That is without a dragon. If there is a dragon in the Colosseum then the event will not change until u finish the event and claim your reward. Happy to help.