The way I've thought about it is when I'm "salaried" I'm being paid for my brain, not my time, and this cuts both ways; if I can meet the goals the company has

The way I've thought about it is when I'm "salaried" I'm being paid for my brain, not my time, and this cuts both ways; if I can meet the goals the company has set for me in 5 hours, that's all the time I'm going to take. However, if I need 50 hours to figure something out, that's what I'll do. The understanding I expect to have with my employer is that I expect them not to give me more work than I can reasonably do in ~40 hours, on average. It's not a cut and dry calculus, but if I feel I'm being given more work than I agree to do, that starts a conversation. I could see the role you're looking to fill being something similar; the agreement you have with the employee is that you, the employer, won't put more things on their plate than they can generally handle in 2-3 days of working each week.