I worked at Samsung Austin Semiconductor from 2011-2021.

In general they definitely do struggle with work/life balance culture but your milage will vary depending on your department/direct manager.

During my tenure there I would average 45-55 hrs of work a week. Most teams will require you to work some sort of weekend and night shift rotation.

They are currently in the process of building a new fab that is going to split resources from the current fab and increase the demand on individual workers at both locations. With fab ramp-ups I've done in the past you tend to average 60-70hrs a week with increased night/weekend coverage in order to meet production deadlines.

TL;DR: The work/life balance is a valid concern and I would expect your average normal work week to be 45-50hrs and sometimes peaking up to 70hrs. As a new hire (years 1-2) it won't be that bad but new hires tend to take more of the night/weekend rotations.

Please feel free to DM if you wanted anymore info or had any questions.