It's already 03/03/2004. I was wondering how often do they update the Service Centers' processing times?

They do it twice a month. Around the 8 of every month reflects dates posted on the 1, and on the 23 reflect the dates posted on the 15.

These are approximate times.

TSC is showing processing Feb 25 as of last update but I know 3 people who sent I751 in early Feb'03, and none has heard from BCIS.

To me it looks like they would update a Service Center's Processing Time Report dates on many websites including this one as well. But when you actually scroll down, you will see the old time stamp for the Case reseipt.