@CountryMage
Your reading comprehension must be terrible...
The sorceror had said, "Is he able to remember the chant durations for every spell? Even I can only remember the chants I'm good at."
Meaning the sorceror doesn't even know the chant durations for basic elemental spells mentioned a page before.
If it was something difficult to remember, instead of a 2-digit number, then it would be valid. Don't tell me an adult human being can't remember a few 2-digit numbers he uses every single day in his work life.