"Guy walks along and sees Pablo Picasso chilling in a cafe watching the world go by, the man goes up to him and asks, 'Wow nice to meet you, can you draw me a sketch on this napkin? I'll pay you for your time!' Picasso scribbles on the napkin for a minute or two and hands it to the man, the man asks 'Thats great, how much?' Picasso replies '$5,000', astounded the man says, 'but it only took you a few minutes! I'm not paying that much!', Picasso says 'Yes, but it took me decades to be able to do that in a few minutes, you're paying for the decades of experience, and in decades to come, that drawing will be worth a lot more.'".
My point being that you shouldnt be leasing your time, you should be providing $100k worth of value and charging $20k for it, regardless of how long it takes.
And if i'm the customer and i know that you can provide $100k of value to my company, then i'll happily pay you $20k to do it.