When and how could I see a return on my investment?

There is no guaranteed timeline or outcome. Potential ways investors might eventually realize a return (if at all) include:
• The company being acquired;
• The company going public (e.g., listing on a stock exchange);
• A future secondary market or other liquidity event, if available.

Any of these outcomes are uncertain and may never occur. You should only invest money you can afford to lose.