Well I'm probably the furthest away from an extended light cycle as u can get and certainly not a scientist but I'm having trouble finding a benefit to your idea.
Aside from the question of how the plants would react depending on where u live an unusual light cycle longer then 24hrs would have your timer on times fluctuations all over the map peak hours vs non peak.
I've been contemplating shortening the overall day but it would have the same effect on the hydro costs.
If your curious enough try it. There are lots of myths and things people must try themselves to believe and if it excites you to keep growing and try stuff only one way to find out.
Good luck