Fill the bucket

I want to fill my bucket using both cold and hot water.
I have two different taps for both cold and hot.
The hot water tap fills the bucket in exactly 6 hours and cold water tap fills the bucket in exactly 4 hours.
I turn both of them on simultaneously to fill the bucket but I forgot to turn off the tap which removes the water out of the bucket.
This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket ?
 



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