Thank you for asking this question!
I would describe what a Network Marketer is, is someone who is an Affiliate with a company who pays you a commission for completing different tasks including Building a Team under you, and creating sales to new or existing Team members. Or someone who owns a Traffic exchange or other Businesses and makes money from sales to other people who sign up and upgrade at those TE's and mailers.
Network Marketing has grown significantly over the last 20 years to a point where there is a lot of fake get rich quick scams going on, so one has to be careful not to join just any Business. But instead do your own due diligence in choosing a reputable company as an example the company I joined (SFI) has been in Business for 19 Years (32 for our Parent Company) and as a testament to SFI's past payments, I have been paid every month since I joined over 4 Years ago and with over 1.6 Million Members anyone wanting to Build a Business this is the best way I would recommend to earn a residual and leveraged income online.
Now I am not saying it will be a slow process but depending how much time you invest into your Business daily and weekly, and depending on how motivated you are to bring in new sales and Team Members will determine how long it will take to be in profit, from a couple month to, well never, if you do nothing with your Business
I wish you much Success!