The working requirements in 24/7 manufacturing facilities is different than most 8-5 jobs. When you have $30B invested into a facility you have to maximize output and that means keeping all of the equipment up and running.
Downtime in one of these EUV fabs is going to cost in excess of ~$1m worth of product per hour. So yeah, you keep it staffed full of very talented maintenance technicians 24/7.