Is that 17 seconds per block <i>globally</i>, or per client? If it&#x27;s global, how long would the average client take to generate a block?<p>If it&#x27;s going to take hours to generate a block, I&#x27;m worried that it&#x27;s going to take forever for an app to generate enough ether to get anything done; buying the stuff using real money is a nonstarter for most applications, so generating it on demand is the only real option.