From One SemperFi Guy to Another:
Here We Go, Section 019.04, Nebraska Administrative Code, Title 272, Chapter 21
"A permit holder shall not carry a concealed handgun while consuming alcohol or while there is any previously consumed alcohol or controlled substance as defined in Nebraska Revised Statutes 28-401 of the statutes in his or her blood, urine, or breath unless the controlled substance was lawfully obtained and taken in therapeutically prescribed amounts."
Hard to get an MD to prescribe alcohol, so it's pure Zero Tolerance in Nebraska CHP for alcohol of the recreational variety.
How long? Depends on how much and your own personal physiology. [How much you weigh....How much you drink.....Your own personal liquor tolerance, for which Marines are famous, but my own is rather low.....Your personal metabolism......Kind of drink: beer, wine, whiskey, schnapps, etc.] The web is full of articles. Just Google and take your pick.
And whatever you do, don't mix CHP and alcohol. If you have a drink on the way home---like you said---leave the handgun in the TRUNK (or minivan wayback). Then you can fend off Bad Guys with scowls, implied threats [real threats constitute (a) 3rd degree assault, a Class I misdemeanor or (b) terroristic threats, a Class IV felony], and/or defensive karate stances. Or just Run Like Hell.
Always a good idea to have one of those lockable cabled car safes for such occasions. Plus you can use the safe for any side trips to the post office, USMC recruiters, DMV, bank, Husker's games, PTA meetings, Tea Party rallies, and similar No-CHP events.
Yours for Safe and Legal CHP.