How to measure how long the output is active

hi all, 
i want to make a vi that measures how long the output is active, i was thinking about measuring the current but that would take up more control lines and i dont want to do that.
so my question is how can i either 
1) measure how long the output is active
2) measure the current output from that channel, ie if i am outputting voltage is there a way for me to record the current output without using an additional channel
thanks all 

sorry i dont usually post questions on forums.
i am activating a motor but only when it is outside of the limits, and so the current draw will be variable, i can measure the current during the calibration phase and then mulitply the voltage by the time that function has been active, but i was wondering whether or not the current itself can be measured and sourced on the same channel. 
it is basically an on off controller and therefore the switching time would be rapid, however i have saturated the input to ensure it would not switch so eratically. 
the output can remain active indefinately if outside the limits
i was just curious whether or not it was capable of measuring the current being sourced from the channel i assumed that it may have that capability since some bench powersupplies display the current output on that channel 
thanks for your responses

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