Help with basic thermodynamics equation (feel like I'm missing something)

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ssolitare
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I want to heat a small reservoir filled with water. I want to find out how long it will take to heat the water from a specific temperature to a specific temperature.

random example.
The continuous power source is 720 watts
The Initial temp is -40c
The Final temp is 70c
No heat loss.
Water amount: 2lbs (I must convert to kg?)

Am I missing anything like conversion? What equation am I working with?
 
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Guessing you want the specific heat capacity eqn Q=mc delta t

You do need to convert to Kg