I bought an AB off of craigslist with what I would assume the factory board. There's no LED on it, which I heard it was supposed to. I resorted to counting like some animal. LOL. Anyways, would it conserve more battery if I turned it off at the end of each round or put it on safe at the end? Each round is about 30 minutes and waiting period is about 10-20 minutes, depending. Should I just turn it off or leave it on and wait?

turn it off it is easier that way
conserves batteries
or just bring spare batteries just in case if you wanna leave it on

also dont forget to turn it back on when your in the game a perfect shot could be missed

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I have several Tippmann with the E-triggers.
The led doesn't use much power, you will never really notice the power consumption. You might want to turn it off due to safety, but not necessary. Besides, the board has an auto power saver on it and will shut itself off after 20 min of no use/trigger pull.