Hi Mark,
$$, who said anything about making money? We just do this for fun!
How long and how much are tough questions. Honestly the majority of affiliates only make a couple hundred a month. Plus it depends on what you consider reasonable. My best guess is it's possible to make from 200 - 10,000 a month within 3 months to 3 years.

If you want to make good money it takes a lot of time and effort to build up.
Here is a great getting started thread from a forum I used to mod at WebProWorld.
http://www.webproworld.com/viewtopic.php?t=21311
Maybe some affiliates that arent quite as tongue in cheek as I was in part of that reply could weigh in with their 2 cents. Speaking of 2 cents - where's JOE??? Hey Joe this ones for you!