It is ideal to use a cadence of more than 100 rpm and a relatively low gear. For example, on an 18-speed bike, place it in low and sixth, low being the smallest gear by the pedals and sixth being the sixth gear outward from the rear wheel.
Thus the time period for becoming a lawyer after high school graduation is as follows: 4 years for undergrad + 3 years of law school + 6 months for bar study, passing, swearing in.
Most lawyers spend seven years, after high school, in school. The first four is spent getting a bachelor's degree, the last three is spent in law school. The time is only half the battle. Getting into law school can be difficult, and good law schools have highly competitive admission processes.