Many lawyers who are sole practitioners or share offices with other lawyers do not have legal assistants or legal secretaries. They also have a lot of legal documents that need typing up. If you are a good, fast, accurate typist and can turn a project back in on time, perhaps you can market yourself to them. Obviously, you won't be able to do those that are time-sensitive or due in court the next day or something, but the routine ones might be an idea. As with anything legal, there is always the concern for confidentiality of client information as it passes through cyberspace into non-secure computers.
Or, you could go to law school yourself, then draft wills on those three days off you have.