How often should I change my CPAP mask to ensure optimal functionality and hygiene? Considering the intricate connection between mask maintenance and effective sleep apnea treatment, what factors should be taken into account to determine the appropriate frequency of replacement? Is it solely based on the material degradation that occurs over time, or do aspects such as frequency of use, humidity levels, and personal skin sensitivity also play a significant role? Moreover, can the presence of air leaks or discomfort signal the need for a premature change, even if the mask appears physically intact? Additionally, are there specific guidelines or recommendations from healthcare professionals that can serve as benchmarks for establishing a replacement schedule? Should one adhere to a specific time frame, such as every few months, or is it more pragmatic to evaluate the condition of the mask based on individual experiences? How can one balance the need for regular replacements with the financial implications involved?