For good 40-45 minute smokes look at MUWAT Baitfish or AF Hemingway Short Stories.
Oliva Little Gs are readily available at about the same size.

I hate to say it, but if all you have is 20 minutes, stick to a pipe.
That's why I smoke pipes more often in Summer and Winter when the temps are at their extremes. I don't want to stay outside for an hour and a half if its 105 or 30.
In Spring and Fall I smoke more cigars simply because it is pleasant outside and I can spend more time out there.