You need to realize difference between work and career. Work is what you described, coming to work and going home and not dong anything extra unless you get paid to do it. That means, not taking work home, not checking your email on the weekends, not coming in to the office on the weekend because you didn't have time to finish it during the week or it easier to do when less people are around etc.
A career is place that you want to work for long time, you willing to work as a team which means you do whatever needs to be done in order to get the project finished. Yes that means that you do check your email(s) on a weekends because someone took the time to send you that email and you should take the time to reply to it. It also means that you do come in to the office if it benefits the company/team etc. Yes you can and should manage your free time with career responsibility.
A career is place that you want to work for long time, you willing to work as a team which means you do whatever needs to be done in order to get the project finished. Yes that means that you do check your email(s) on a weekends because someone took the time to send you that email and you should take the time to reply to it. It also means that you do come in to the office if it benefits the company/team etc. Yes you can and should manage your free time with career responsibility.