How many years of schooling is required to become a reiki therapist?

I have been schooled in Ascension Reiki, and am a Level 13. It includes the Usui Reiki attunements, plus others. I received my training and attunements one attunement per week, and I didn't find it too stressful. But, it didn't take 'years'. The school I attend can be graduated I guess in 12 to 13 weeks. And you don't have to be a level thirteen to be a therapist, I believe it is level 2 believe it or not. (Which is part way through the Usui portion.) .

Basic Reiki (level 1) can be learned by most people over a weekend, but becoming a real Reiki practioner (level 2) takes longer. The process of channeling and becoming proficient with Reiki expands over longer period of time - depending on the students capabilities and the teachings. To become a professional Reiki-healer can take years of practice if one is to obtain many real life cures. To become a highly skillful Reikimaster or teacher builds on the prior 2 or 3 Reiki levels and is an ongoing process. For some teachers it may last a lifetime, because Reiki is not just a healing, but also a spiritual path.