To be clear, I know nothing about manufacturing jobs but yes, I am aware of people who have had a couple of short smoke breaks throughout the day (they either stayed a bit late or came a bit early) at their time.
It depends on where you are (department) within the manufacturing - and what is going on that day.
My H runs the shipping department. If there is a time during the day in which nothing big is coming off the line, and there are no Semi's to be loaded, etc? He doesn't mind people going outside to get a quick smoke.
What does tick him off is when the opposite is true. The goods are coming off the line so fast that they are blocking the aisles, and the truckers are there waiting to be loaded...and then they go and smoke. They generally don't push that - because it is an unauthorized break per the union contract. Yet, you always have a few from time to time that push it just because.
Yes, of course I'm leaving out other dynamics...but you should be able to get the point here.
He can do that in his department, but in other departments? They can't. The machines are constantly running, and you can't leave them unmanned. They do shutdown for the breaks and lunches. They do make allowances for things if need be. Yet, overall the lines need to continue to run...to fulfill the orders waiting to be loaded. The allowances don't happen every day - I'm saying if all of a sudden someone needs to run to the bathroom or something. It takes time to shut down the machines, and turn them back on. You also have the department before you at times waiting for you to finish, and it slows down the whole company.
One thing within the manufacturing atmosphere - especially if unionized - if you do something for one you must do something for all. So, if you have to shut the machines down an additional time each day for prayer? You would have to do so for others as well. The customer's wouldn't get their orders on time - or you are asking the company to take less orders just to accommodate workers. In this financial climate? You don't want to give the competitors the upper hand, and possibility lose good jobs...which means less hours and salary for the workers. The worse case? You would have to close the entire plant.
This is where 'reasonable accommodations' come in. Sometimes you can change a breaktime to fulfill their need, and other times you can't. You don't add additional break times for to pray, because they have to clock out - so they don't get their full 40 hours they need. If your plant runs 24/7? The scheduling is almost impossible.
There are so many dynamics at play here. You have vendors, customers, shipping, etc. You don't ask them to change the way their company does things to help accommodate prayer times. That's unreasonable.
There are so many working parts to this, and each plant is different.