@beermotor: really, a month to learn to become a cleric or a wizard? You think that's enough? I know of little trades that take so little time to learn. Becoming a secretary nowadays is a 1-2 year training time. Becoming any type of professional takes between 3 to 10 years. In both those cases, we assume you start with highschool or higher education, i.e. about 12 years of prior academic education. Assuming that the mundane occupation replaces the prior academic, I think at least a few years is a minimum to become any class in DCC if we're looking at some form of realistic approach. I would think that no church would let a cleric loose to the world after a month of training (none does that nowadays). A month is not enough to make sure that the person is dedicated enough. Think about any employee in any company that has been there for a month: he's far from being proficient in his trade. He's barely learned anything. I think that, to learn how to read magic, then how to weave it, would take years! Even for the two other classes, fighter and thief, you think that you can learn how to fight with a variety of weapons properly in a month? Or learn how to use a variety of skills, and also how to battle as a thief? I doubt it myself. A couple of years sounds a minimum. I've taken karate classes and it took me a year to pass my yellow belt (first upgrade). I was far from proficient in karate then, I barely knew the basics.
@gnomeboy: yeah, that's also what I thought. I was thinking that maybe some people had original answers to this however, that I had not though about, that would allow me to run my adventure in a somewhat continuous timeframe. I've considered for example the PCs "receiving" knowledge in some mystic way, e.g. through contact with immortal beings or magical items. But I dislike the idea for my campaign, for now, and would prefer mundane training.
Maledict Brothbreath, level 4 warrior, STR 16 (+2) AGI 7 (-1) STA 12 PER 9 INT 10 LUCK 15 (+1), AC: 16 Refl: +1 Fort: +2 Will: +1; lawful; Armor of the Lion and Lily's Blade.
Brother Sufferus, level 4 cleric, STR 13 (+1) AGI 15 (+1) STA 11 PER 13 (+1) INT 10 LUCK 9, AC: 11 (13 if wounded, 15 if down to half hit points), Refl: +3 Fort: +2 Will: +3, chaotic, Robe of the Faith, Scourge of the Maimed One, Darts of Pain.