"That may be so - the REPORTING of the charge-off may take 9 months, but by law (FDIC), the account HAS to be charged-off at 180 days of non-payment - 120 for written contracts."
*** Sorry, but that is not true. As noted in Bigun's post before yours. Per the FDIC, "For operational purposes, whenever a charge-off is necessary under this policy, it should be taken no later than the end of the month in which the applicable time period elapses. Any full payment received after the 120- or 180-day charge-off threshold, but before month-end charge-off, may be considered in determining whether the charge-off remains appropriate."
The above says that this is for OPERATIONAL purposes. Further it says it SHOULD be taken "NO LATER than...." not that the "account HAS to be charged-off at 180 days" as you state.
It appears that both of you are taking the information applicable to one thing (FDIC operation of a financial institution) and assuming that it applies to another (FCRA). The government is full of contradictory rules, especially inter-agency ones. Personally, I feel the BEST rule to follow when applying the FCRA (or FDCPA, etc) is the governing body.... in this case, the FTC.
I also refer you to another FTC staff letter (Brindkerhoff-Amason) on this same subject, at:
http://www.ftc.gov/os/statutes/fcra/amason.htm
As a sidenote:
I had noticed a few weeks ago that this FDIC rule had somehow gotten involved in the issue of SOL dates, but really didn't take issue with it until now.

Heck, and while we are on this topic of discussion... the FTC allows a debt to be reported by a CRA for a period of 7 years PLUS 180 days (to allow for the return to the APPROXIMATE DOLA). This is shown in the same FTC staff letter referenced above.