Before I had kids I'd regularly work 12+ hour days. Afterwards I am much better at time management. This has nothing to do with caring about my work (which I

Before I had kids I'd regularly work 12+ hour days. Afterwards I am much better at time management. This has nothing to do with caring about my work (which I do to a fault). It's about realizing that raw hours do not necessarily make an engineer more effective, and achieving big things is a marathon not a sprint.