@greg_howard @LazarusLong13 He's saying the risk is low. Wash your hands before and after touching the mask and reduce it further. I'd add: avoid touching the inside of the mask.
But if you want, you can time out the mask too, no harm in it. Masks aren't THAT scarce any more.
@greg_howard @LazarusLong13 他说风险很低。接触口罩前后要洗手并进一步减少。我要补充一点：避免接触面罩的内部。
但如果你愿意，你也可以让面具超时，这对它没有害处。口罩不再那么稀缺了。