From Fallen London Wiki
As of January 4th, Preparations is now 2360, having decreased by almost 100 in less than two weeks. We're currently around 116,000 CPs away from Level 0.
Considering we've decreased ~13k CPs since December 14th, exactly three weeks ago, we can average that out to around 619 CPs per day.
Given that average, we'll reach Level 0 in around 188 days, on July 10th.