Great thread. You've received wonderful replies and I'll just add that while it may be good for kids to begin practicing small decisions now in preparation for making larger decisions later, to keep slow decision making from being annoying for a parent, you may wish to consider stating which option will be the "default" if he doesn't answer within x minutes.

This introduces another lesson - which some might call "window of opportunity", or "strike while the iron is hot", or "the show must go on", or "not making a decision IS making a decision", or "analysis paralysis".