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Depends on the model but all the ones with integrated battery usually have between 2-36h depending on the setting (flash lasts forever). They have indicators and will switch down to flash when running low to get you home.
I did some run tests on my Toro and Joystick with/without the red eye rear somewhere in this thread or one of hippys transam/tcr maybe, I don't exactly remember which...
Exposure do have an "outlet" on their website with some discounted models. The other option is to look for last season ex-demo stuff from places like Rutland Cycles (I think...)
Exposure fixed my out-of-warranty Toro recently. Turn around under 5 days, £12 or so including return shipping. Excellent customer service!