Commercial expediency is not an emergency. If your business catches fire on Shabbat, of course you rush to put it out. You feed your chickens on Shabbat if they need it and check their water. If a construction project falls behind it's not ok to make up lost productivity on Shabbat. Most delays are due to shoddy workmanship and poor planning as per my personal observations on job sites. Rework increases time by three fold. Haste literally makes waste. I've seen jobs finish ahead of schedule because work was careful, short cuts were avoided and mistakes prevented. Plan your work, then work your plan. Recently one contractor refused to use floor leveler for an old slab before installing tile because it was too expensive. Really? Inspector demanded tile be broken out three times and untrained workers finally got it to pass on fourth attempt by using a huge amount of thin set. Those who refuse to observe Shabbat engage in just such delusional thinking and gain nothing. Many times I've returned to a job on Monday, been shown contempt for my refusal to work on Shabbat by those who took Sunday off after making shoddy work on Shabbat. I point out rework on Monday, repairs are made and by Tuesday we are finally doing original work. So, doing six hour shift on Shabbat they create eight hours of rework on Monday to get to Friday on Tuesday. Please God, don't laugh at us silly humans.