It's easy when you're a salaried office worker to get roped into working evenings and weekends to get a critical project done...but why do that now when it's clear OXY literally doesn't give a sh**? You could be the best employee they've ever had, but if the bean counters decide it's better for the bottom line to cut you, you'll be dumped on the curb in a heartbeat.
Take some time for yourself, and your kids especially if you have any. You won't look back 10 years from now and say, "gee, I wish I had worked longer hours."