Just how TERRIBLE is the battery life ?

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http://forum.xda-developers.com – I wanted to get this phone as a replacement to my Nokia N8. Having been loyal to Nokia over the years, I'm used to absolutely excellent battery life, where I get a good 2 days of normal use, or easily get through 1 day of heavy use. Would the Galaxy Nexus be a really bad step down ? Can anyone suggest their average battery life when having: 25% screen brightness, GPS/BT/NFC/etc off until needed. Sync only for WhatsApp Messaging 1-2 hours a day Music 2-3 hours a day Browsing 1 hour a day (HowTos)