The main factors are...temperature, number of pictures using the flash, etc...
I am filling 256 cards at a 5 minute delay before my batteries go dead right now.
It's really hard to say without looking at all the variables with your set ups.
I can tell you mine will be dead in three days right now on my P-41s.
But, that is 500 pictures later...
I take a fresh set of cards and freshly recharged batteries with me on each trip.