[Griffin]

I think different players define streaks in different ways. Some look at it like you do. Others consider month to month. I look at it from session to session. If I start with $1000 and have one winning session then I've just started a winning streak. This streak will last until I have a losing session. That one losing session will start my losing streak, which will last until I have a winning session.

How big can they get?

I don't know about others, but I haven't played long enough to have one of those month long, tear your hair out losing streaks (I'm sure it's coming though). After only 200 hrs of record-keeping for 1/2 stakes, my biggest losing streak in terms of number of sessions is 3 losing session in a row (has happened 3 times). The most money I've lost in a losing streak for those records is $122 at a rate of losing 11bb per hour.