How do level 120 items level?

Jake [skylit] told me in jms, approx 1 training session fully leveled up his or dennis [whoever plays jms here, tkwizard and co] reverse weapon. So maybe a few hours?

O_o I'm the only one in the English community that has a Reverse equip. lol It wasn't a single training session. It was about 33% - 40% per character level for each level up on the Knuckle. It's still pretty fast, however.