How can I find out if my fiance has 40 credits of work?

It says that if you have 40 credits of work, the form I-864 does not need to be filed, how do I find out if my fiance has that many credits of work?

Answer:
40 credits = 10 years of employment, www.ssa.gov I think may cover this issue.
  • how to emigrate to austalia?
  • Can an ex felon fix my status?
  • what is the full form of CII?
  • What can we do to force our government and media to address the lawlessness along the Mexican border?
  • Is Ricky Perry helping U.S. citizens?
  • Do illegal aliens pay this much in taxes? How can they send 50% of their paycheck back to their country?
  • UK Certificate of Registration - Reporting Leave?
  • My family is Rhodesian. Do i qualify in any way for British Citizenship?
  • How provable is for the USA government to pass a amnesty in the USA?
  • Is a Schengen Tourist Visa valid for one country or are you only allowed to stay 3 months in ALL EU countries?