From a manager's perspective, I see this a lot, people who overcommit to their work, thinking that they are responsible for everything. I appreciate their effor

From a manager's perspective, I see this a lot, people who overcommit to their work, thinking that they are responsible for everything. I appreciate their efforts but that's never expected (and anyone who does is abusing you). What I expect are sustainable and realistic expectations. Losing someone because they couldn't sustain 80+ hour work weeks is about as useful as someone who works 20 hour weeks.