Hi there. First of all writing is a long shot inhaling money. This means that you could probably earn money after some time. For me, I started here and after 3 months earn my adsense money. From there on, is history.
Some hubbers take 6 months and some take longer. Average is would say 6-9 months.
Traffic I would say traffic from search engines are better than hubpages itself. So yes you get my point. I would say for start 5 to 10 per day is good.