It would all depend on how thick the layer is really, also what the conditions are, ie. is it warm and sunny outside. I've used chrome spray paint before on some fan blades and it did take longer than your average paint to dry, just 'cause it's thicker I guess.
I need to do a few more coats and a clearcoat on top yet but here's my out of the can result after one relatively heavy base coat with Simoniz Chrome Spraypaint on my modded Dragon bezel. Hopefully it'll polish right up when I'm done. BTW - I just found a Product Recall on some of this stuff, so if you get some, check the batch number.
I used chrome spray paint and it did not dry, even after a few weeks! I found that sealing it with clear paint (ahhh... what's it called??) was the only way.