How many times a day does Casper Ten Boom read his Bible?

Father read the Bible multiple times per day.

Father stood up and took the big brass-hinged Bible from its shelf as Toos and Hans rapped on the door and came in. Scripture reading at 8:30 each morning for all who were in the house was another of the fixed points around which life in the Beje revolved.

".... when the shop people arrived and Father took down the heavy Bible from its shelf."

After the briefest possible discussion of business, Father would draw a small Bible from his traveling case; the wholesaler, whose beard would be even longer and fuller than Father’s, would snatch a book or a scroll out of a drawer, clap a prayer cap onto his head; and the two of them would be off, arguing, comparing, interrupting, contradicting—reveling in each other’s company.

Father was eighty years old now, and promptly at 8:45 each evening—an hour sooner than formerly—he would open the Bible, the signal for prayers, read one chapter, ask God’s blessing on us through the night, and by 9:15 be climbing the stairs to his bedroom.