(a) End-to-End. (1) The service standard for Sectional Center Facility (SCF) turnaround Standard Mail?pieces accepted at origin before the day-zero Critical Entry Time is 3 days when the origin Processing & Distribution Center/Facility (OPD&C/F) and the SCF are the same building, except for mail between the territories of Puerto Rico and the U.S. Virgin Islands.
CFR 39-121.3-2014 history
2014CFR 39-121.3-2014 Postal Service. Part121:Service standards for market-dominant mail product. Section121.3:Standard Mail.