There are many factors that determine when you should change your strings; coated or uncoated strings, environment, chemical makeup of your skin, how often you play, etc. So there is no set number of days/weeks for every situation. Best advice is to change them when they start sounding dead. The more you play and the more you change your strings the more you will know when it is time to change. At three months, it would be a good time to experiment. Play the guitar now and remember how it sounds, then change the strings. If you notice a big difference, you probably should have changed them sooner.
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