If you like the new EXP rings, there is a way to use it for 6 hours in a row, or for a +2000 exp bonus, but you can only do it once a week. [Using the +50% ring].. When your charge is 1/7, use it, then trade to a guard to reset charges. You will now be able to use the effect again as soon as you want (wait for the charge you just used to wear off). I'm not sure if this would work any time that you recharge it, but I am sure that it works when you go from 1/7 ยป 0/7 and then recharge... The same effect could also be acheived by dropping your old ring and buying a new one, but recharging is cheaper... This can work on any rechargable item.
