It's quite possible to shift forms in a dream, even drastic shifts. I recently spent most of a LD doing nothing but testing the difficulty of assuming various forms, and the only one I couldn't do was a potted tree. And perhaps I'm just not creative enough to visualize what it must be to be a tree, I don't know.
As far as how long, it seems to depend. If you're a bird, and flying, most likely you're going to stay a bird. If you're a shark, and stay swimming, you should stay a shark. If you stop for a while... that's where you can spontaneously revert. A form seems perfectly stable so long as it 'reminds' you that you're in it, whether by moving or whatever. When that wavers, you can lose it... but that goes for anything in a lucid dream, really.
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