Isn't this more to the point---documenting your equity in the AI hands you both won and lost. In other words, the key to assessing downswings is identifying variance. This requires honesty and time away from the table calculating your equity in significant hands played.

I have experienced some nasty downswings of greater than 15 BI over short-periods of time (4-6 weeks) playing Live 2/5. Of course, variance is a key factor, but there's usually a point at which tilt weaves its way into your game. And I'm not just talking about hard-emotional tilt, but more subtle non-A game "leaks" in your game that appear when you're under more pressure than usual.

So if you use the downswing as motivation to analyse your game on a regular basis, it should turn you into a better player, because you'll simply become more aware of your weaknesses.

Also, read Jared Tendler's The Mental Game of Poker. If you've got what he calls "accumulated tilt", then take a decent break.

never really had a bad streak at 1-2nl live. Maybe like 4 buyins tops

at $2/3 my biggest downswing is about -$2400. Lots of coolers (set over set, KK<AA), ridiculous beats like QQ < 85o all in preflop, super carddeadness, and tilt/spew.