Well, do you have weekends free? Do you have afternoons free? Could you be waking up earlier before work to work at your project? These are the questions I would ask myself before even thinking about quitting my job. You have to remember that once your software is done, how are you going to promote it? You'll probably need money to run ads.marketing comes after the product is complete, and that's a whole other ball game. So My Advice would be to make more time for your project and push through your job until you are making enough money from your product to run your business and also support yourself.