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Unless you are doing work that involves lots of tiny particulate matter (and even if you do), I think 50 n95 masks is pretty darn excessive. Most people don't even wear them correctly.

I was under the impression an n95 could last much longer (Days/Weeks). Could you help me understand why you feel it will last just for hours?

N95's not bad, but N99 (FFP3) is what you probably want for viruses. In theory these are designed to last a "shift" (8h). The manual should explain how to use it safely.

I'm not aware of the possibility of cleaning used masks. Just because the outside is clean, it doesn't mean the filter's still good.

If you want something cleanable get a full face mask with a cartridge filter. These look like (and actually can be) a gas mask. It also clearly communicates that you're serious about this, unlike the peons with those silly normal masks.

Protective eyeglasses is a good one. I wanted to get some anyway, but keep forgetting about it.