https://www.cnet.com/roadshow/news/tesla-model-3-production-suspended-planned-update/

Tesla idled production at its Model 3 assembly facility in Fremont, California for four days in February. According to Tesla, which confirmed the downtime, it used this time to "improve automation and systematically address bottlenecks in order to increase production rates," a Tesla spokesperson said in an emailed statement. "This is not unusual and is in fact common in production ramps like this."

The waiting is the hardest part. (Aside from the manufacturing, in this case.)