Nevada does not have a waiting period for either residents or non-residents.

As for the issue of whether a drunk person can legally marry, it should be noted that current Nevada law (under Nevada Revised Statutes 122) is silent to the issue. Lack of understanding is a valid reason to annul a marriage under NRS 125.330, and case law appears to support intoxication as a sufficient condition to cause the want of understanding. (This may be an option, as previously noted, but the case law supporting this statute also states that the annulment would only be in effect from the date of the filing, not the date of the marriage.)

What is clear under the law, however, is that it is illegal (under NRS 122.220) to have a marriage solemnized by a judge, chapel, etc. without having a marriage license. (From what I can tell in my office copy of NRS, this statute has been in place for nearly 40 years.)

In other words, the chances are quite good that the OP's friend has been legally married in Nevada for the past 20 years or so.

Mike (who is not a lawyer and is not giving legal advice, just reading from statutes)