Well duh!
The most known philosophers usually came from backgrounds where they had idle time and weren't working fields, then The Industrial Revolution and other innovative periods started opening up more and more leisure time... and entertainment only goes so far! Are we supposed to contemplate our navels?
Perhaps "waste of time" is too pejorative for a natural consequence of not constantly needing productivity to survive.
Labour Jersey made the same point as me. I personally agree that abstract philosophy ("how many angels can dance on the head of a pin?") is a waste of time, but there is much more to philosophy than that.
In Peanuts/Charie Brown, Charles Schulz clearly loved mocking philosophy by using that line, but Peanuts/Charlie Brown was also probably the most philosophical (mainstream) comic strip ever.
I'll see you
Peanuts and raise you one
Calvin & Hobbes.
