I would have to go back and look at iRex's numbers. But I believe they have said that it will last up to 24 hours in suspend mode (theoretically, based on a full battery charge and the mA that it draws while suspended).
You'll only see that if you leave it in suspend mode and are not using it (turn it on and walk away). Otherwise it'll be somewhere in between the current battery life and 24 hours, depending on what percentage of the time it is suspended during your normal usage. For example, if your suspend is set to 5 seconds and you are continuously turning the page every 2 - 3 seconds, then it'll never go into suspend mode and you'll get the same battery life you do now. However, if you turn the page every 60 seconds, then it'll spend most of that time suspended, and it should dramatically improve the battery life.
How well it works in real life is yet to be seen, but a lot of it will depend on what setting you're using for how quickly to suspend, and what your usage pattern is like.
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