Theres two ways to go this, one do it quickly and do nothing else with your life (no other job) or keep your job and fly on the side.
If you do it and only it then of course it goes quicker, and you inadvertently save money (you spend less time in the air revising stuff you learned last week etc etc), I've instructed people that flew two days a week and those that flew multiple times a week and the multiples are usually better. Some say they will fly loads of hours in the few days they have available in a week but eventually peoples learning for the day plateaus.
That being said looking at the hiring picture right now there are a lot of people out there that have the minimum qualifications, and it use to be that you could spend all your money (or your parents money) and still get a job but now even those oppertunities are drying up, it doesnt mean you wont get a job of course but it is harder and more expensive. There are good signs out there tho, Ryan Air put in a big order for new aircraft that are mainly for expansion and EasyJet will do so soon too. There are also quite a number of people that leave for the middle east.
My advice is look at your situation, no family/kids and money to blow go for it, especially if you have the ability to keep your job on the side. You only get one life and best spend it doing what you want, but at the same time dont *%@! it up and be broke :P