What's the longest you've waited for BTC to drop so you could buy more?

I know many here love to DCA, and I do that each paycheck, but I have a significant amount (for me) of available fiat and I want to buy at some a price that's even lower than what we're seeing as of late.

I've been holding my wad (with a limit order) since July. But I'm itching to blow it and just buy now at this very low price. What stops me is that I just feel the economy is going to get worse and I'm confident BTC will still be correlated with the stock market when it does.

I realize that timing the market is generally a fools game, but it seems so likely the market will crash in the next 18 months or so that I want to wait and get in at a ridiculously low price and bring down my average. So I'm curious... Has anyone else had (is are you having) a similar experience? What's the longest you've waited before giving up on your plan and buying in?