I'm pretty sure last time I hit a billion chips in this game, it took me only a few weeks to start losing it again and I remember for the longest time I had trouble even getting back up to 500 million. But through arduous sesh after arduous sesh, I finally crawled my way back. No crazy massive bets. No drunk players basically giving huge multimillion pots away. Just a lot of grinding.
Oddly enough, just like I wrote in that last post I linked above, I'm again waiting for my food stamps to kick in. Talk about irony.
EDIT: Welp, it only took a couple of days and I dropped back to around 950 million and I'm having trouble staying much above that.