The frequency of restringing your tennis racket depends on how often you play and your style of play. Here are some general guidelines:

1. For Regular Players (3+ times a week):
   Restring every 3 to 6 weeks. With this amount of play, the strings lose tension and performance quickly, and you may want to replace them to maintain optimal control and power.
2. For Casual Players (once a week):
   Restring every 3 to 4 months. Casual players typically don’t wear out their strings as quickly, but over time, strings will still lose tension, affecting your game.
3. For Occasional Players (once or twice a month):
   Restring every 6 to 12 months. If you're not playing often, your strings may last longer, but they’ll eventually degrade and lose tension.
4. String Breakage:
   If your strings break, it’s obviously time for a restringing, no matter how much time has passed.

Additionally, if you start to feel less control or power in your shots, that’s another sign that your strings have lost tension and need replacing. Some players also choose to restring based on the number of hours they've played (e.g., every 40-50 hours of play).

Does this help with your scheduling? Are you a regular player or more casual?