Back "in the day" late 90's I rode 500 shares of Tellabs down from $68ish to mid $30ish (Ma Bell spinoff bid for a smaller rival but eventually was bought by Lucent which itself is no longer around) till it came back to entry point a few months later and got a couple more for the hell of it before bailing around $71ish.
I had the patience (was supposed to be a daytrade lol) and bull market behind me but I have never come close to ever letting that happen again.
Learned to measure my patience in waiting minutes or hours at most - otherwise cut and run. Also, for me, to stick with futures only.
Curious, do you remember where you got in on Tellabs?