No, not so much a specific dollar amount, as I don't fascinate on the investment value, really.
The big driver has been about monthly cash flow.
Three big turning points:
1. Getting monthly expenses well below income. (Took watching the budget very carefully, some changes, it was a lot of work)
2. Saving money to offset our biggest risk. (FU money) -- to cover changes on our variable rate interest. (so I could sleep better at night)
3. THEN, having more income through part time work, raises, etc., that we did not work too hard to get, only increasedour base skills over time and made ourselves available to opportunities.
and BINGO! I can't find enough places to stuff the extra cash. I am in horror of the taxes being paid on it, and started to take classes to learn better strategies to deal with it. Putting into place that better plan now...
The fact that behind the scenes, we did not move (yet again), avoided buying a 5 yr old or newer car, didn't travel, all while the stock market rose dramatically, meant that the investments grew fast without our noticing too much, and no debt taken on.
Specifically, for investments, a big turning point was when I had to actively asset allocate the account -- the new cash hitting it was no longer sufficient to re-balance, I had to actually sell investments and move the money to another asset class.