A professional guitar setup is typically recommended every 6 to 12 months for regular players, though the ideal frequency depends on how often you play and the environmental conditions where you store and play your instrument. Players who perform frequently or in varying climates may benefit from setups 2–3 times per year, while occasional hobbyists might only need one annually or every other year.
Between professional setups, you can maintain your guitar by keeping it properly humidified (wood is sensitive to humidity changes), cleaning it regularly, and restringing when needed. A setup addresses multiple aspects: adjusting the truss rod to manage neck relief, lowering action (string height) at the bridge and nut for playability, ensuring intonation is accurate, checking fret level, and examining hardware for damage or looseness.
Several factors suggest you need a setup sooner: if you notice buzzing or high action, if the intonation seems off even with a new set of strings, after significant temperature or humidity swings (common during seasonal changes), or if you've had a fall or impact. New guitars sometimes benefit from a setup within the first few months as they settle into their new environment. High-quality instruments and vintage guitars may deserve more frequent attention to preserve their value and playability.
Ultimately, you don't need to follow a rigid schedule—listen to how your guitar sounds and feels. If it plays smoothly with clear tone and proper intonation, it's fine. If problems develop between regular setups, don't hesitate to address them promptly.