Any worthwhile accomplishment is likely to take a long time.
Maybe a brilliant idea comes to you in an instant and takes minutes to implement. But it's likely the product of years of prep – of honing your craft and immersing yourself in an environment that provides inspiration and stimulation.
Earl Nightingale said, "Never give up on a dream because of the time it will take to achieve it. The time will pass anyway.”
A mantra to live by whenever the biggest obstacle is how long something will take:
The time will pass anyway.