That seems like a long time to wait.
With indie-publishing, you get to choose when your book is ready to publish. You could publish a whole trilogy at once if you chose to.
The question becomes, is there an optimal time to publish your PERFECTED novel?
The answer is now! Go for it. Just don't do it before it is really ready.
Once you have one novel published. Get the next written. Once it has been edited and is perfect publish it. The best time to do that? Right then.
Every moment you wait, you are losing money.
When a customer reads your first novel on their digital device and like it, they immediately look for anything else you've written. How do you satisfy their craving for your work? You write and then you publish your well-written, perfectly edited books, over and over and over again.
That is the secret to indie-publishing success.