Every Google Home device is already running an ML model to do speech recognition to recognize the "hey Google" wake word, so sooner than 10 years. The Raspberry Pi Zero is a particularly underpowered device for this. Doing it on the Coral TPU accelerator plugged into a pi zero would take less than 30 mins. Doing it on an iPhone 15 would take less time. Doing it on a Pixel 8 would be faster. Not to diminish getting it to work on a Pi Zero, but that future is already here, just as soon as we figure out what to do with them.