Yes. Pick a random number 1-10 and then multiply it by 4, and then by the number of self-titled "founders" in the startup hiring you. That's the number of hou

Yes. Pick a random number 1-10 and then multiply it by 4, and then by the number of self-titled "founders" in the startup hiring you. That's the number of hours it will take to finish after each founder has complain and asked you to change something. But seriously, most guys who can predict hours needed with any amount of reliability are the guys who have been doing it for awhile and have already done a similar job. They use past experience to predict amount of work hours needed to finish something. If you truly have no idea how long it will take you, you could begin by breaking up the project into each piece and try to project how much time each of those pieces would take. For example, how long will the design take, the homepage, the about page, the forms. Break each feature apart and try to estimate time for each, then add them up. My best suggestion is just to overshoot your hours. If they accept the offer you should work hard to make sure you meet the deadline and if you go under the deadline, be honest and tell them how much money you saved them.