The question is how far can you break things down. Also what your job is (if you need to wash your hands before starting that matters)

If you are sewing a ballroom dress (that is any very large project) you probably need longer stretches to get it together. However you could take an individual piece and put in a few embroidery stitches.

Still it does feel like you get 2 minutes of work for your 15 minute break

This won't work for the sewing itself, but while Siri itself is still a hot mess, it can launch shortcuts into other apps. Aka can ask "Siri captains log" and I've configured my phone to launch voice recording so I can journal via voice. That isn't the same as actually sewing, but organizing my thoughts has value, especially if it's during time I otherwise would have burned.