This base period covers 12 months and is divided into four consecutive quarters of three months each. The wages you were paid approximately 5 to 18 months before the disability claim begins are included in the base period (they must have been subject to the State Disability Insurance [SDI] tax). Your base period does not include wages paid at the time your disability begins.
Law school is three years long. If you go to an average law school and don't get any tuition help or scholarships, you are going to spend ~$150,000 all-in, at least. That's three years of tuition, assorted fees, books and living expenses.
The short answer for how long does it take to become a lawyer is that in the United States it takes a minimum of three years. In order to practice law anywhere in the western world, one must pass an examination in the geographic jurisdiction that the proposed lawyer wants to practice law.