setTimeout() ignored in loop

I have a function called myFunction that can be called once from an
onclick() or 100 times from a function called  loopFunction which
contains a for(var i=0;i<100;i++) loop.

Within myFunction is a setTimeout() function like this:

setTimeout(function(){shuffleDoor()},1500);

Now, when I call myFunction from onclick() it waits 1.5 seconds and
then calls the shuffleDoor function, just as I imagine it should.
However when I call the function from loopFunction it is called 100
times but there is no 1.5 second delay between calls.

Why is this?

Thanks in advance.