I live in North Dakota, so accounting for weather I get maybe six months of outdoor play time if I'm lucky. I average about four 1.5-hour sessions per week. I have never broken my strings but usually restring as soon as the courts begin to open up after the snow melts. Being an amateur, recreational player I only own two racquets. I intend to use one as a main and the other as backup. Because I've never broken my strings, it might be safe to assume my backup racquet will rarely, if ever, be used. If that's the case, how often should I restring it? I've read that though the strings may never see action, tension loss will still occur. Even so, I find it hard to convince myself to replace strings that have hardly been used.