How long will an N95 mask last?

Could you elaborate on the durability and lifespan of an N95 mask? I'm particularly interested in understanding how long it can be safely worn before needing to be replaced. Are there any specific conditions that would shorten its useful life? And are there any recommended practices for extending the life of an N95 mask while maintaining its protective properties? Clarifying these details would greatly assist in understanding the proper use and maintenance of this important piece of personal protective equipment.