Every day of my life is me telling my boss/coworkers... no, I can't have that to you in 2 hours... Yes, you heard me right, I said it would take at least two weeks to get that design fleshed out and finalized. No I can't just copy what you see on Google Images.
Slightly less art related: My boss wanted me to completely redesign our website, provide all the visual assets, and get our copywriter to completely rewrite everything on that website... in two weeks. He just genuinely had no idea how long that kind of work took. I said it would probably be 6 months at least.
I don't think people understand the decision making that goes into creative work. You don't always automatically have the perfect first idea that becomes the final product, no matter how creative you are. 