Saving time with chart log record

Is it possible to save the time in ms ?
I need to save the log values in real time and make a graph out of these values. I need to be able to recreate the chart graph in excel.
What I have now is not precise enough because for different results ( average 6 values) it record me the exact same time with a precision to the second. 
 So with the Roborun utility, is it possible to get a more accurate time record ? 


Thanks you 
Sana