Chuck Guzis wrote:
 Write a loop that executes, oh, 10,000,000 times.  Get
a stopwatch.
Start the program and the stopwatch simultaneously, stop the stopwatch when
the loop ends.
 
Hmm I  need a real PC and a real StopWatch! The watch could be hard to find
since they don't make mechanical ones anymore.
 Calculate the average time per instruction as (time to
execute/(10,000,000*number of instructions in loop)
 
The XT  can only loop $FFFF times. :D