What is the duration between a conference and its online proceedings? I recently attended an IEEE conference and presented some work. Empirically, how long does it take for my paper to appear online?

On both: live chat and the FAQs, I got the response that it may take several weeks. That is less than useful. What is the average duration in general? 


  How long does it take for conference proceedings to be loaded in IEEE
  Xplore?
  
  IEEE publishes more than 1,300 leading-edge conference proceedings in
  electrical engineering, computer science, and related fields each
  year. Conference proceedings appear in IEEE Xplore approximately 30 to
  60 days following receipt of the content by IEEE. Please note that
  conference proceedings often arrive at IEEE several weeks after the
  conference date. To view the status of a conference, download the IEEE
  Xplore conference proceedings title list (options at bottom of the
  page).
Depending on the particulars of production on both the conference side and the IEEE side, you should expect anywhere from a few weeks to six months.  Both the IEEE and the conference staff can introduce delays here (I was recently publication chair for a conference whose proceedings were delayed by five months by the IEEE simply because they kept dropping the ball).

Note, however, that the IEEE allows authors to put a copy of their own work online.  This means that you can make your own work accessible much more quickly, and can often find PDFs of the works other others as well, well before the official version appears in IEEE Xplore.