I don't think that either happens during EMH. Your best bet is probably to either go at rope drop or sometimes later in the evening/ night. Either would be shorter than mid-day because the combination of AC and characters is very attractive in that hot Florida weather. Baymax usually isn't very long, but joy and sadness have been around 40-80 minutes recently so you can choose to go at separate times if that's better for you. Best of luck to you