My wife and I were at a movie last night and I was wearing my Seiko Sportura. It has a great lume in the beginning, but after 90 minutes it really died down and couldn't make out the time. I was thinking that I should have worn my GW-2500. I know that my Giez doesn't have a great lume. Then I was thinking about what G-Shock has the longest lasting lume. I thought it would be a good forum topic. So has anyone timed the duration of their lume?