My highest switches between soldier and demoman, both at around 10 hours. Scout's pretty high, but I'm terrible at aiming the scattergun. Spy and Sniper are the lowest because I'm not very good at them and there usually isn't a huge need for them since they're fairly popular.
Interestingly enough, Demoman actually used to be one of my least played classes until I got the Chargin' Targe.
Interestingly enough, Demoman actually used to be one of my least played classes until I got the Chargin' Targe.