Ladies, do you find that when your boyfriend/husband has a a bit too much to drink that it takes them forever to cum?

It's called whisky dick for a reason

Never heard that expression before. I've never determined how too much booze affects a woman. Of course if she's not your wife or girlfriend I will always pass on fucking a girl that had too much to drink. I need them to be sober enough to consent
- As far as I know, “whiskey dick” refers to not being able to get it up, losing your erection, or having a partial erection due to drunkenness.
  
  To your original question, alcohol/drunkenness will often make a guy last longer. I think this is a relatively well known phenomenon.
  
  One reason is desensitization: alcohol tends to numb sensations. This leads to needing harder oand/or longer stimulation to get off.
  
  Another reason is mental state: alcohol tends to help people let go of inhibitions and nerves. Guys (really, people in general) can get anxious about their performance. Worry about cumming too fast is often self fulfilling; the anxiety and focus on the problem makes it happen. Alcohol usually lowers anxiety, keeping that vicious cycle at bay. It’s the same with erection issues. Alcohol can quell anxiety and make it easier to get it up… but it’s also walking a tightrope; too much alcohol and whiskey dick may occur.
  
  Edit: oops, I’m not a lady. Just a dude who has experienced of all these things :p

Yep, you're welcome.

Macbeth, Act 2, Scene 2:

Lechery, sir, it provokes, and unprovokes; it provokes the desire, but it takes away the performance: therefore, much drink may be said to be an equivocator with lechery: it makes him, and it mars him; it sets him on, and it takes him off; it persuades him, and disheartens him; makes him stand to, and not stand to; in conclusion, equivocates him in a sleep, and, giving him the lie, leaves him.

Yes.

Quick in the morning, but in the evening after even a couple of beers, so much endurance I tap out. Which is sort of bad as I find it so much easier to get off (and again, and again) in the afternoon or evening, but then get so tired, oof.

If he wants to go a long time he says Viagra and some drinks. I guess that is both relaxed and propped up. I asked about intensity but he says always about the same.

Yeah, it't fairly common knowledge that alcohol messes with that ability.

Yup, I know drinking heavily affects my function in the bed. If I am planning to perform, I'll plan around it. If it is spontaneous, I a just as needed to achieve the desired result.