My idea of "appearance time" was about the collectibles appearing and dissapearing. They don't just appear and stay put until they're collected. it dissapaears eventually. I hope this helps...

Well, talking about Unpickable collectibles....I've just started a new village, both kids couldn't pick up a mushroom!! It appeared right before my eyes and both the kids cldn't pick it up!!

This is the first time it's happened to me now... and my villagers were desperate for food!!