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The skull of Marquel didn't care who completed the task.
Too bad, I don't have time.
There really isn't enough time. I initially chose five months, thinking it would be enough. If you knew in advance how to complete the tasks, you could possibly finish quickly. But as it is, you stumble around like a blind kitten. For example: I took Marquel's Skull and dug up the Tear of Ashi at the very end. I just couldn't manage to position myself on that one specific cell. There is very little information about the tasks! A lot of time is spent constantly shooting down the appearing troops (I even leveled up a couple of heroes for this). I definitely don't want to replay from old saves, as the turns become incredibly long.
I love interesting and challenging maps, and this one is one of them. But I prefer to see the goal and find a way to achieve it. Here, the goal is not always clear, and many things are done to slow down the player (for example, why drown secondary heroes in the lake when their help saves a lot of time).
I hope that it is still possible to win all the stars without completing the task.