How many times can I wear N95 mask?

Good afternoon, esteemed financial guru. In the midst of the current pandemic, the use of N95 masks has become increasingly prevalent. However, there's been much debate regarding the proper reuse and lifespan of these masks. Could you please enlighten us on the frequency of usage for an N95 mask? Is it advisable to wear it once and dispose of it, or can it be reused safely under certain conditions? Additionally, what are the key factors to consider when deciding whether to reuse an N95 mask, such as the type of activity or exposure level? Your insight into this matter would be greatly appreciated.