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3 hours of guitar practice a day can be beneficial for someone looking to improve their skills quickly. However, it’s important to maintain a balance and not overexert yourself, especially if you’re a beginner. Playing guitar for too long can lead to injuries, especially to the hand and wrist. It’s also worth noting that the quality of practice is more important than the quantity. So, while 3 hours is good, it’s also important to ensure that you’re practicing effectively and not just for the sake of putting in the hours.