Yeah, that's not how you do it. 1. Under-promise for a sustainable output pace. 2. If/when you finish early, everybody gets an appropriate amount of time off.

Yeah, that's not how you do it. 1. Under-promise for a sustainable output pace. 2. If/when you finish early, everybody gets an appropriate amount of time off. 3. Repeat. Your client is happy, and your team is happy, healthier, and ultimately more productive.