How do I protect a wooden clarinet from cracking?

Buffet Crampon advises protecting a wooden clarinet from rapid changes in temperature and humidity: direct sun, winter outdoors, heaters and air-conditioning. It limits a new wooden clarinet to 30 minutes' playing a day for its first month and advises swabbing the bore dry after playing. Buffet Crampon notes that a properly repaired crack does not affect intonation or tone.