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.
You do not have to major in one particular degree program to become a lawyer. Lawyers have various types of undergraduate majors, including business, economics, humanities, pre-law, science and political science. Also, consider pursuing an undergraduate degree that is similar to the type of law you hope to practice.