Whenever I do that (whatever my number is) my wife says, "Its the same 5k you lost yesterday."
However, over the years, that number has gone up. The market has been our friend on balance.
The markets have returned an average of just under 9% annually as far back as records are kept. The markets also advance on average 2 days out of every 3.
Never invest any cash you will need in the next 5 yrs, invest on a regular basis, reinvest all dividends and distributions, re balance as needed and sit back while the magic of compounding makes you very comfortable if not down right rich.