While it is generally still light enough to see 1/2 hour before and after sunrise and sunset in most of the US, what is or is not enough light to safely see and hunt is way more involved. A person's latitude plays a factor as the sun rises and sets at a different angles, dependent. Twilight will last over two hours in Alaska at times, and only 20 or so minutes at the equator.
Deep canyons, thick trees and cloud cover can further make shots totally difficult due to lightning, despite the sun technically being up. A person's eyesight could also be a factor.
So, no....alpha scopes for civil daylight only wouldn't necessarily be a complete waste of money, from a light gathering aspect alone. Nevermind quality internals.
