Lighting here is that post from Frank. Again good luck.
Doe.Mouse
Sorry I havent gotten back to you in a shorter time since you posted the message but it took a little research to find the law.
here it is on the US Gov Web site
its under the CODE OF FEDERAL REGULATIONS
TITLE 49, VOLUME 4 PARTS 200-300 REVISED AS OF OCT 1, 2000
FROM THE GOVERNMENT PRINTING OFFICE VIA GPO ACCESS
CITE: 49CFR377 SUBPART B, SOURCE 50fr 2290, JANUARY 16 1985., UNLESS OTHERWISE NOTED. REDESIGNATED AT 61 FR 54709 OCT 21, 1996
UNDER PAGE 816
B) WHEN A CREDIT PERIOD BEGINS. THE CREDIT PERIOD SHALL BEGIN ON THE DAY FOLLOWING PRESENTATION OF THE FREIGHT BILLS.
c) LENGTH OF CREDIT PERIOD, UNLESS A DIFFERENT CREDIT PERIOD HAS BE ESTABLISHED BY TARIFF PUBLICATION PURSUANT TO PARAGRAPH D OF THIS SECTION., THE CREDIT PERIOD IS 15DAYS. IT INCLUDES SATURDAYS, SUNDAYS AND LEGAL HOLIDAYS.
d) CARRIERS MAY ESTABLISH DIFFERENT CREDIT PERIODS IN TARIFF RULES. CARRIERS MAY PUBLISH TARIFF RULES ESTABLISHING CREDTI PERIODS DIFFERENT FROM THOSE IN PARAGRAPH (C) OF THIS SECTION. SUCH CREDIT PERIODS SHALL BE NOT LONGER THAN 30 CALENDAR DAYS.
iF YOU WANT TO READ THE REST OF THE PUBLICATION GOTO THE US GOV WEB SITE, GPO SUB SITE AND SEARCH FOR 49 CFR 377
HOPE YOU FIND THIS INTERESTING
FRANK