Isn't it significantly faster and more accurate to just turn a knob or move a slider to the middle? 500ms and no conversational interruption vs. 5-10 seconds where everyone has to be quiet.
BTW, always on the lookout for an offline only voice activated clock with multiple timers. wifi for NTP only is also acceptable; no cloud allowed. 98% of what we use the voice assistants for is task timers; it's nice to have those voice activated so everyone knows they were set.