In Alabama, the Certified Volunteer Firefighter course through the Alabama Fire College is 160 hours. Thus, everybody refers to it as "the 160 class".
In Michigan for a volunteer most depts. require FFI and FFII certs. To get those you need a min 260 hours of class/hands on training
Oregon doesn't set specific requirements for volunteer or career. The training classes are all the same for either side. Oregon follows NFPA and requires about 100 hours of training to certify as Firefighter 1 after a 6 month cooldown after you complete training. Then if you want to become a career firefighter you at least need to be an EMT-Basic to get looked at by any department in Oregon. That's another 100ish hours. As a volunteer you can pursue any level of training you wish and the state doesn't require certification to function but most fire departments again most departments require state certifcation to function in a given capacity.