SpaceX will consume your life - if you let it. It's up to each individual person to figure out a work/life balance and if you aren't aware, you'll be pulled into the center of SpaceX and start wondering where all of your time went. However, stay aware of this and keep reasonable hours and you will be able to keep a healthy work/life balance. Also beware of the freshmen 15 - but this one is in terms of relationship danger. Starting to work here, you'll find yourself swept away by all that is SpaceX and that can end up weighing heavily on relationships. Make it through the first 6 months and your relationship will come out stronger on the other side - but it is just another thing to be aware of.