[bacbilla]

You sound similar to me; although perhaps I am a few years further on in my career.

I don't think there's anything inherently wrong with what you're describing. All of my promotions/progressions in my career have come from being willing to go the extra mile and work on/learn things outside of my role. Sometimes this involves working early/late/on weekends. Unless you're a true prodigy or have an exceptional management structure around you that gives significant experimentation/learning during your normal working hours I feel this will always be the way. Either way, it sounds like you have a healthy work/life balance.

I think if you intend to have a long career in your industry (or indeed any industry) at some point you will experience burnout(s) in some form. Accept it for what it is and learn how to handle it. It may take different forms; for me I generally notice that I get distracted a lot (and get frustrated with myself for it). Sometimes the solution is time off; sometimes it's changing companies/roles (especially if you're early in your career it's likely you'll outgrow your current company/team at some point).

Much like exercise, you'll learn the signals your brain/body is giving you over time; they'll be unique to you. You'll probably get it wrong at some points to. The key is acting on those signals early. I write letters to myself about how I'm feeling in those moments, and then revisit them when I'm struggling. It's been extremely useful for remembering how I felt previously and knowing when to step off the gas.

But the short answer is no, I think you are working the right amount.