NEW DELHI—President Trump’s flight time for his India journey this week will whole about 36 hours, a steep trade-off for about the similar amount of money of time in the country. But his diplomatic fall-in was as rigorous as it was short, with his hosts offering expansive red-carpet treatment method that the president applied to celebrate the most politically favorable stretch of his presidency.

“It was a superb two times,” Mr. Trump said Tuesday at the begin of a solo news conference in the Indian funds, employing a soft voice, almost a whisper,…