Ok, so I bought the unbreakable choir bell yesterday after I found out such an item exists. I was planning on just buying a wholes stack of the choir bells from the TP, but I like permanent stuff. However, after I started playing around with it I felt like I was being cheated out of my gold, because the bell gets unequipped after just one minute and it is annoying to have to constantly go to my inventory to use it again. When I was switching the octaves, I’ve noticed that the timer goes to 14m (but the bell still gets equipped after about a minute), so I think the bell was originally intended to be out for 15 minutes before it gets unequipped.
Also, one additional question: is octave switching supposed to reset the timer?