Great Post! You've discovered what some might even call a 'universal law'. That is, what we 'focus' on, always tends to expand.
In other words, you allowed yourself to get distracted from your real goal - e.g. to get your basic idea/concept written in a form that you could present, before the deadline.
Once you realized this and made the proper adjustment, your focus returned and you were able to move forward fairly rapidly.
Remember folks, nothing quite takes us to our goals more quickly, than 'laser-beam' FOCUS.
NOTE: Special thanks to George for stepping up and being the first reader to submit a personal experience on the topic of business planning. I can't wait to see WHO's GONNA BE NEXT? :-)