This may not be the case, me myself have seen people using "prayer time" as a reason not to work during office hours. Sometimes it takes them an hour of "prayer" when in fact its suppose to take 15 minutes at the most. How many prayer times during office hours at least three times so that will approximately take 3 hours on an 8 hour work shift. do the math multiply it by 5 times a week, a month and a year then do the math. That is why my company fired those lazy *ss employees.
I'm not an Islam hater, unlike many on this forum, but I agree with you. You can knock out a prayer quickly. Many Muslims push their luck on this one. A private employer is paying you for work, not prayer.