Back on the envelope - on mobile so forgive no sources:<p><pre><code>  150b Bing searches&#x2F;yr (from 12% mkt share)
  --&gt;37.5b voice searches

  500m iOS devices (ignoring Cortana&#x2F;Alexa as negligible)
  --&gt;75m have ever used Siri (15%)
</code></pre>
Implies 500 voices searches&#x2F;year or one or two per day, per Siri user. Seems high<p>Edit: found a source on Quora that suggested 1b Siri queries per week. So it&#x27;s in the ballpark- since not all of those will be web searches