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Charging at 1amp=1 hour per 100 MAH. In your case 1800MAH=18 hours from full dead. You can charge them at higher amp rates but I wouldn't recommend it.
1 amp is 1000 milliamps. It'll take closer to around 2 hours at that charge rate.
If you aren't sure how long it will take, then put it on the charger and every so often go and check on it to see when the battery starts to get warm. Once it gets around 100*F then you should take it off the charger.