How long does it take to upgrade from a Class B to a Class A driver's license?

[LaXavier]

To upgrade from a Class B to a Class A driver's license for a tractor-trailer, you need at least 3 years of driving experience. Below is the relevant information: 1. Medium-sized bus driving category: To apply for an upgrade to a medium-sized bus driving category, you must have held a license for city buses, large trucks, small cars, small automatic transmission cars, low-speed trucks, or three-wheeled vehicles for at least three years, with no record of accumulating 12 penalty points in the last three consecutive scoring cycles before application. 2. Tractor-trailer driving category: To apply for an upgrade to a tractor-trailer driving category, you must have held a license for medium-sized buses or large trucks for at least three years, or held a license for large buses for at least one year, with no record of accumulating 12 penalty points in the last three consecutive scoring cycles before application.