Please bear in mind that a face covering on its own is not an effective preventative. Current guidance is to wear a KN94 or 95, and to ideally change it each day.
I’ve also heard we can wear the KN94 for up to 60 hours, and that you can re-use a K95 a week after your first wore it. Fortunately, these masks are pretty cheap right now. Stay safe if you choose to.