[GeeTwo]

This one is closer:

Originally Posted by cpapplefamily

or do I

double lastScan,thisScan:
...
...
   protected void execute() {
     
      thisScan = *some clock value;

      if(thisScan < lastScan + 1000){

         myCounter = myCounter + 10;
         lastScan = thisScan;

      }

    }

Seems then we can only safely calculate with time values Greater than 20ms and could be of by +19ms

but the comparison in the if statement should be ">" or ">=", not "<".