Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
When these are correctly maintained and well taken care of they can go for many hours, so much so that there is really no way to put a number on it. With that said you would want to check things like overall visual condition, compression test, just look at how it has been taken care of and it will show.
Again there's absolutely no way to say how many more hours you may or may not get out of it.
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