<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by goodflyer:
How long does it take to clear immigration?
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1 minute to 30 minutes, from my experience.
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How long to get to the city and back?
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If you use a toll way, I would say 30 minutes one way.
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Can I get a cab to the Grand Palace and back?</font>
Yes. After clearing customs, you will see a sign for taxis. You need to pay 50 baht extra for taking a cab from there.
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How long does it take to clear immigration on the way out?
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1 to 3 minutes.
The only problem you might face is you might get caught in a traffic jam. It's a rainy season now. It pours all of sudden in the afternoon or evening. When this happens, it gets so bad.
But I think eight hours is long enough for a city tour.