Raising her hand, Anna said, "Is it that the effects of the gillyweed only last for about one hour at a time? This means that those using the gillyweed, Potter included, have to time their quests just right. They have to consume the gillyweed, go into the water, and then be safely out in sixty minutes...or actually less than sixty minutes...time." Thinking some more, she added, "The effects of gillyweed also don't successfully protect us from underwater creatures who still see us as exactly what we are---humans. Sure the gillyweed gives us gills and webbed hands and feet, but otherwise, we still remain very much human-like. We still have the mindset of a human and only limited to what a human can do."