Cephus
Relentlessly Rational
Yes, there is a minimum time... thanks for pointing that out. Also, I don't think the federal government recognizes them. Without a valid marriage there are issues of Social Security benefits, immigration, and actually almost 1,100 protections, benefits and rights in legal marriage. It alternately amuses and saddens me to hear people say the government shouldn't be involved in marriage. Well, it is and the genie is out of the bottle.
I believe that they are recognized at every level, they really have to be, the equal protection clause of the Constitution requires it.