The requirements for school are different in every state, but the national average is 500-750 hours, which takes 6-9 months. It's trade school, not college, so it's much easier than traditional college courses.
Everyone has a different opinion about how good the job is and how easy it is to find work. Most are self-employed. If you are good marketing yourself it's very easy to build a practice. You can find traditional employment, but the pay is low, typically around $16 an hour. Physically your body is limited to 20-25 massages a week.
I did not enjoy massage, but many people love it and can't imagine doing anything else. I owned a spa and it was much more trouble than it was worth, so I went back to my old career. The average massage career length is only 6 years with high burnout rate due to low pay and physical injury.