A simple timing of the program can be enough. At beginning, save the time in a variable, run the program, read time at the end, the difference is your runtime.
If program is too fast, put it in a loop and run it as many times as needed.
StartTime = Timer
For RunCount = 1 to 10
Next
EndTime = Timer
RunTime = EndTime - StartTime
if you need more details, a profiler can help.