Billy thought that he would need a few days to learn those three spells, but in the end, he learned them after a single night. The only issue was the fact that Detoxify and Relief would need to level up more to become more effective. Detoxify worked against most types of poisons, and Relief was like a painkiller. Billy wanted to teach those to his friends to avoid unpleasant surprises during that job, but it probably won't be a good idea while they are in that state. They could wait for a while longer, and besides, it wasn't like they were in a dire need to learn that. There was also the issue of compatibility, maybe not all of them could learn those spells. Or some of them might learn faster.