ATLANTIC CITY — It was 22 ½ hours until the start of the biggest event of Dmitriy Salita’s career as a boxing promoter, the homestretch when he needed to make sure all of the kinks were ironed out: contracts, tickets, paychecks.

But he turned his cellphone off, watching the time carefully.

In a 15th-floor hotel room with floor-to-ceiling windows overlooking the brightly lit Ferris wheel on Atlantic City’s boardwalk, he bowed his head and flipped through a thick, pocket-size book, whispering to himself and pacing back and forth in prayer.

He then sat in a chair with a plate of food and settled in for the next 24 hours, when he essentially would be walled off from any involvement in a production that could vault — or set back — his budding promotional career.

Salita, a 37-year-old former welterweight, is the rare Orthodox Jew in big-time boxing and, as such, he observes the Sabbath.