It depends. I run a certain suite of apps when I'm on battery power than those I run when I'm plugged up. Right now I'm plugged up and running all of my CS6 apps. I don't do this on battery power. On battery, I run Outlook, Word, Firefox, TextEdit, Acrobat Pro, and a few new small apps. I turn my keyboard brightness down to one bar and my screen brightness down to four bars. I do run wifi and Bluetooth (the last should be turned off if you're not using headphones or the like).
I don't use iTunes, any CS6 apps (save for occasionally booting up Photoshop for something quick), watch movies (save for a few YouTube short features), or anything else that would stress the CPU, GPU (I use my Intel GPU under battery), or that is RAM intensive. I could probably eke out about another hour or more if I shut down everything except Outlook and Firefox (if you look at Battery Health - the app - it will give your approximate times of how many hours you'll have remaining if you're just "Internet Browsing," for example).
Let your battery get back to a good state and you should be able to get 7+ hours, at the least, if you'll just be very mindful of what you're doing and what you're running whilst on battery power. Try running just your browser and your mail app and see how many hours you can get. Battery mode is simply not meant for full-blown 'work loads.'
Good luck,
Clinton