It depends upon: 1. battery capacity (the higher the capacity, the longer it will take) 2. how discharged the battery is (the more discharged, the longer it will take), and 3. how much charging current is being used to recharge (more current results in reduced time, but you should not use more than 4A charging current according to the safety label on top of the battery). Bottom line, it's hard to answer your question without knowing what is your method to recharge the battery.
It is so small that it shouldn't take too long. Look at the capacity, divide it by 4 (the maximum charge recommended and figure it out.
