The esteemed professor must be lecturing or something.
Its about 5.40 pm in Brazil so he's probably driving back home after a hard days lecturing. Is it Brazil that has huge traffic jams or somewhere else? He'll likely also have his dinner before he starts posting here so give it a few more hours.
Actually at 5:40 PM I was planning to prepare to gather will power to start writing a quiz for my 21:00-23:00 class. Going home now...