As Deposed King said, short stories aren't really going to sell. I have one short story available and another on the way that are purely there as a little bit of an extra for my existing readers. I'd suggest getting out of thinking in terms of pages, and into thinking in wordcounts. Number of pages is decided during internal design and typesetting, and if you went to an agent or a publisher, they would ask for a wordcount, not number of pages.
You really do want to aim for 80,000 words, and then when you have that done, either seek out a literary agent, or hire a professional editor (or, if you know someone with the right skills and experience, see if they'll do you a favour an edit it for free, or in return for something else). You're going to need that expert, third-party opinion. And not just to catch spelling and grammar mistakes, but for structural edits, too, like continuity, pacing, themes. My first novel wound up having the first 50 pages cut. My second required a complete re-write before my publisher would even offer me the contract.
Of course, you can be an astonishing writer, and you won't get anywhere if you don't put in the work elsewhere. Build up an online platform. Start a blog, build a website, get on social media. Engage with the writing and fandom community, but don't act like a salesman. If you post nothing but sales pitches, people will ignore you. It's a real connection people look for, that encourages them to take a chance on your book and tell others about it. They'll help you succeed because they want to see you get to write more books.
When people tell you they've read your book, as them if they'd mind posting a review on Amazon and Goodreads. Host giveaways and contests to draw attention to your brand.
But during all this, remember that the only way to reliably draw more attention to your work is to keep writing. I had a book out in 2012 and in 2013, and this year I have two out. And I still feel like I need to write more and get more books out there.
As for time, well, I'm not renovating a house, but I work 40 hours a week, with an hour commute each way. My wife is a wheelchair-user so there are things she needs help with around the house, and certain household chores she simply can't do. And we have three babies under the age of 2. I get up at 6am every day, including weekends. After getting the girls to bed and having dinner, it's often 8 or 9pm by the time I get to sit down and unwind. I write before I leave for work, during my lunch, and for a few hours every Saturday and Sunday morning.
You find the time for the things that matter, and that's what you need to decide, as Meg said. It's all about priorities, and
Pretty much anyone can get 500 words written in one hour, if they focus on it. With practice, this will easily go up to 1,000. If you write just 1 hour a day, and give yourself weekends off, you can write a draft of an 80,000 word novel in 16 weeks. Give yourself another 4 weeks to account for spellchecking and edits before sending it to an agent or editor, and that's 20 weeks for one novel.
Even with a busy schedule, you can easily get 2 novels written each year, with 12 weeks off for holidays and special occasions.