My experience has been that the Incase will provide power from about 8am until 5pm without any issues. This is heavily dependent on what I'm doing as my WiFi, BT, and 3g are always on. Around 5 when the battery drains to the point I'm using the iPhone's internal battery which easily lasts until around midnight or so, again, heavily dependent on usage.
Without the Power Slider I would have to charge multiple times a day. Guaranteed. I've had some really heavy days where I've drained the slider by noon, charged it, and drained it again by 5, but those are days off when I'm doing nothing but playing iMob and leaning on the radios pretty hard.
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