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how long?????

seanm said:
I think it would also depend heavily on if you keep the EQ flat, or rely on a lot of boost. The boost is going to draw more energy.
Maybe, maybe not. Depends on the topology and how the design is executed and biassed. All my discrete designs are class A throughout, but some IC's use class B biassing especially in the output stages of the chip. So for my discrete it will make no difference, and the IC designs, varying amounts depending on the individual chip, but the load each stage is working into will likely be a bigger issue.

For the original poster's question, unfortunately it's not possible to give a straight answer on battery life. All my active designs vary by a considerable amount, and the one that I designed and sounds best (by far!) would eat a pair of batteries in a few hours, so I power it remotely from the preamp, a-la Alembic.
 
I´ve got an 18V Peavey Cirrus. I play it ocassionally since I bought it (Sept 03) and still haven´t replaced the batteries.
I have another 9V bass which I often play and they last 6-8 months.

Saludos desde Argentina

Papersen.