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Welcome to LAVA! The short answer to this is: You cannot do time constrained operations (within the millisecond area) using a regular PC. Other processes will "steal" CPU time which can put your program on halt for several milliseconds (up to several hundreds), so the timing is not predictable within your constraint. However do you really need to calculate a value every millisecond? According to your description the dispensed volume is a linear function over time. This means as long as you know how many milliseconds elapsed since a specific moment in time, you can calculate the total volume dispensed. The following VI is an example on how to do that: This will give you a new value after 1 second, however keep in mind that there is still a chance it could take more time depending on how busy your computer is and which process gets priority. One recommendation after reading your VIs: Please make use of controls / indicators before using local variables. It makes your code much more readable and removes unnecessary complexity.