Builder's Whetstone, Builders Precision, etc... these 15 minute lasting adornments are totally useless, because they give too little of a boost to be of any significance, and personally I never find the time during an instance when I could apply them. Also they're just cluttering up the inventory, and you can't even transmute them. So either make them at least last for 1 day, so people bother to actually apply them to any gear, or make them much stronger, OR remove them from the game as useless rewards. thank you!
Or, you could just destroy them since they are such a bother to you. I happen to use the ones I get and I don't consider them useless at all. As for how long they last.. as the name suggests, they are temporary.
I just crash them mostly on sight, didn´t bother at all, but sometimes the bonus is just nice, if i wouldnt foget them that fast ^^
