I think the "Earn 50 Event Tokens" daily quest is a poor quest to have for captains.
I think it's fine for viewers because you have 3 (or 4) captains for whom to place. When there is an token chest event with event currency (like Elemental 2), that's fine as well for captains.
However, for smaller captains, this quest means as many as 25 battles that need to be won in 24 hours, and smaller captains aren't going to be playing 10+ hours.