They had just pulled Bull down to 660, now it is back up to 669 and as of yet they are not running water, I guess because of downstream high water. So, just based on past operations, they'll pull Beaver down to 1128 or so, then stop running Beaver, pull TR down to 915, then they'll pull Bull down to 660 (again). Barring anymore heavy rain, they'll get Beaver down pretty soon, take about 1-2 weeks to get TR down (unless they do something drastic like open flood gates), then Bull is going to take close to 3 weeks to get down to 660.
Based on that (and that's just a WEG), we'll need probably 5 weeks at least just to get the whole chain down to where it was just a few days ago. And that's without any additional significant rain.