There is not a fixed amount of battery life, so it is impossible to say the exact life of battery, however there are simple ways to extend battery life.
Remember that as it is used more, an iPod's battery life will shorten if not charged properly - always charge it when it is lower than 20%, at 0% if possible, and try and not charge it so it is over full.
Make sure apps are closed after use - double click the home button and close the apps that appear at the bottom.
Reduce screen brightness when possible, Turn of Bluetooth when not using etc.
I suggest installing 'Battery Doctor' - a free app that extends battery life when charging and gives tips to reduce battery consumption.
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