All conditions gained during an adventure, except for permanent negative levels, ability drain that does not reduce an ability score to 0, and conditions that provide no mechanical effect, must be resolved before the end of the session; if these are not resolved the character should be reported as ‘dead.’ Permanent negative levels, ability drain, and non-mechanical conditions being carried over to the next session should be recorded under the Notes section of the Chronicle sheet. An unplayable character should be marked as dead when reporting the session. See additional rules under Dealing with Afflictions in Chapter 7.
I agree that it's not really spelled out that well, but in conjunction with James' quoted section it basically means "You have to resolve everything, though you can do so by waiting."For example, my character contracted a disease. Adventure over --> I had to resolve it. I decided to sit it out, rolled all the days right after one another, took 4 points of ability damage, waited until it was gone, everything was peachy again.
EDIT: Just read something said in this thread: Ability Damage is not a condition.
So...no need to note it! Yay!