shifts per day- hour per shift length of work week
shifts per week (weekends for example
Better to just look at historical data - remember just one part can stop production (Elon talks about USB cable - even arranged for next day
air to US from Asia - over credit limit so it wasn't shipped. Then Tesla sent out employees to every computer store in Bay area - yes, even Fry's. Similar with carpets, I think - the cars stacked up in the factory parking lot. Number of days in a month or quarter. People often try to read way too much into daily, weekly even monthly numbers. Quarterly fine and now most all makers doing the same.
side note: Tesla more integrated than most [one seat frame for S/X/3/Y complete seats made near Fremont Factory.
Sandy Munro clips are very detailed - IF you are seriously interest in the nuts & bolts of manufacturing.