It's difficult when there is a Maze Event AND a Breeding event. Breeding/hatching are major contributors to earning maze coins, so the tree is full. Along with that there is a Breeding Event creating more Hatchery congestion. Taking it one step further, there is also the Mystery monster requiring a Hatchery spot.
A Hatchery Breeding Guardian will decrease the long hatching times allowing players at least a chance of success for completing the full breeding Event. I've never completed one; there's not enough time. Anyone else feel the same way?