Verdantstag's drop pattern is now confirmed. The 6-hour respawn window combined with the 15-hour hatch timer means a player who skips even one boss cycle will fall behind on incubator uptime.
Players should pair Verdantstag runs with the other Bamboo Temple bosses so the incubator always has an egg queued. Hourglasses should be reserved for Verdantstag drop windows unless the player has a deep Hourglass stockpile.