How often should one consider replacing their CPAP mask to ensure optimal performance and comfort? Is it sufficient to swap it out only when visible wear and tear becomes apparent, or are there more nuanced factors that should dictate the frequency of replacement? What about the impact of skin oils, cleanliness, and the general upkeep of the mask? Could variations in individual usage and hygiene practices also play a significant role in determining its lifespan? Furthermore, in the realm of varying mask materials and designs, do some require more frequent replacements than others? Is there a universally recommended timeframe, or should each user take a personalized approach based on their specific circumstances? How does the experience of sleep therapy change with an old versus a newly replaced mask? These questions linger in the air, captivating our collective curiosity about the maintenance of a critical health device. What insights can be gleaned regarding the optimal schedule for mask replacement?