I think this is answered by the comments:
If you choose to anonymously share your analytics data (in the data settings), then you will receive a benchmarking report from Google comparing your stats with websites in the same industry vertical - including page view times and bounce rates. Not sure of the frequency of reports though. – Roger Attrill Jun 20 at 12:10
with further information about where it is from:
@TorbenGundtofte-Bruun It's hard to find for sure. Click Admin at top right shows a page where you can change settings. There's a breadcrumb trail at the top like "All accounts > accountname >". Click All accounts. Select the account of interest. There's a set of tabs (Properties, Users, Filters, Data sources, Account settings) Pick the Account Settings tab. It should show a section titled Edit Analytics account - with sub sections General information and Data sharing settings – Roger Attrill Jun 25 at 20:28