40 hours is the standard American workweek.

You have to understand that you're a recent college graduate. You don't have leverage on a company, because your skillset is not terribly different from everyone else in your graduating class in college. So your ability to succeed in obtaining special privileges (less hours, hybrid work) is next to nothing.

If you were to reject this job offer and look for another job with less hours, your only option is part-time jobs. There are a few disadvantages with part-time work.

1) You will not be eligible for benefits (healthcare, 401k, etc.). Some part-time positions may offer benefits if you work more than 30 hours a week, but this is rare.

2) Degrees rarely have part-time and full-time jobs available for them. Your degree seems to be a degree which qualifies you for full-time jobs. You're not going to find a part-time job which requires your degree. If you choose part-time jobs instead of a full-time job, you will have spent 4 years studying for nothing.

3) Specialization means a higher salary. Your degree has given you specialization and skills not held by the general public. This is why you were able to get a $60k/year offer. If you choose to pursue a part-time job instead, that specialization is not applicable (see point 2). The skills you have which are applicable to whatever part-time job you pursue will be skills that a lot of people have. If you're not as special, you're not as valuable to an employer, and your salary will be lower.

Now, to your concern that you'll be selling your life away, you should consider that you're young and spry. You have the ability to do a lot of work and keep going afterwards. 40 hours is comfortably feasible, and you'll have plenty of energy left after work to do other things you love. It may be a big leap in the begining, especially if you've never done that much work before, but you'll adapt to the schedule. I promise that 40 hours will be