Well... okay, if a human were starving, and there was food five feet away, but the human knew it was poisoned and would essentially make him a slave forever, would he eat it? That's basically the situation Erik will be in. I think the answer is, "it depends on the human." And in my mind, Erik did not become the leader of the local resistance by being weak-willed. So, in any case, it will at least take him a long time... I would think on the order of 10-12 days, to finally give in and drink it.