On YouTube, the "How to Make a Simple Mask" videos with the most views are by attractive women, some with videos longer than 10 minutes. That's either a coincidence, or people don't just want to learn how to make a mask; they want to learn how to make a mask by watching a pretty woman for the most amount of time.

If you don't care who's teaching you and just want the information in the smallest amount of time, these are the three no-sew mask-making methods with the shortest videos I've seen:

2 minutes, 10 seconds.

Old T-shirt, with duct tape and twist-tie for molded nosepiece:

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1 minute, 19 seconds.

Super simple, sock:

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45 seconds.

Rubber bands and any fabric, by the Surgeon General:

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