Depends. From 4000 BC - 3000 BC, it's only 20. From 1000 AD - 2000 AD is a lot more. As the game progresses, the turns take up less years. There is a breakdown of the turns in the FAQ stickied in this forum.
That's the thing... it changes!!!Luthor_Saxburg said:Some wonders can became tourist atractions, which start to give money 1000 years later... OK, but how long is a 1000 years?
He! He! "How long is a 1000 years?" is like a trick question, isn't it? I mean how many turns is it?
At the start of the game, it'd be 20 turns... at the end, 1000 turns.
(Check the info box on the bottom right corner of the screen for the date.) But anyway, that's why the earlier you build a Wonder, the better - because the sooner you build it, the less turns it takes to get to 1000 years and that nice culture/commerce bonus. 
Lord Parkin said:That's the thing... it changes!!!At the start of the game, it'd be 20 turns... at the end, 1000 turns.
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Seems like. At least, in scenarios based on years you really 1000 turns...not 20 and so on.What if the game is based on weeks? There will be no tourists?

I don't think the AI cheats on combats. Maybe on the number of units, but not on actual combats.Shujaa said:Does the AI cheat in combat rolls at Regent and lower difficulty levels?
Assuming that the warrior is veteran or regular, the chance lies more somewhere between 5 and 10% for losing. Although that it is still possible to lose frequently if luck is not on your side.Luthor_Saxburg said:An elite swordsman attacking a warrior should have roughly 80% of chance of winning. So, in every 5 attacks, you should expect to lose one swordman.
NWOG said:If a wonder is made absolete, does it still produce culture?

Shujaa said:Q: Does it matter whether a unit is regular/veteran/elite when I put it into an army? Does it make a difference?

Zelda's Man said:How do you save a screenshot? I thought you were supposed to press the "Print Screen" button, but nothing happens when I do.