“Data expands to fill the space available for storage”; buying more memory encourages the use of more memory-intensive techniques. - Parkinson's Law of Data. This is a theory I have heard in the past. The reason I bring this up is because during a time management course I was taking today (part of the company's mandatory training) they brought up a spin on that same theory.
"Work will expand to fit the time available for it's completion." -- If you let it.
The premise is if you give yourself too much time, you will take up all the time available. If you give yourself too little time, you will feel stressed and defeated by the task before you even begin.
The training has some interesting things to noodle through, but overall it wasn't a very effective use for the time - fun fun.