It'll always take as much time as you have.
Not necessarily as much as you need.
But as much as you have.
If you have too much time, you'll mostly still end up spending all that time.
If you have too little time, you'll mostly end up finishing it nonetheless.
And most of the time the difference between the results of way too much time and way too little time is negligible.
More time might not necessarily make it any better.
It might just eat up more of your time...