I have a tritium pin on my bow which quite nicely follows shooting light almost to the minute (for my eyes anyway). When I can't see the pin, it's over.

I will admit, I killed a huge doe after legal shooting light (by about 10 minutes) many years ago but got a bad shot on her. I did find her the next day, but don't like the guilt associated with breaking the law. Won't do that again, gun or bow.