How long is to long?

My wife and I have been having problems in our marriage for a while now , in fact it's been 3 years now we have been living miserable. I work out of town so we don't spend much time together! When I do go home it's usually not a pleasant time! At some point or another we start arguing about any stupid little thing ! Has it been long enough already 3 years of being miserable, should we keep trying or is that more than enough time? What should we do?
How long is to long?
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