Graves' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). Although a number of disorders may result in hyperthyroidism, Graves' disease is a common cause.
Flight time from LAX to JFK is 5 hours 6 minutes. Delta Air Lines is one of the direct flight which takes 5 hours 6 minutes to travel from Los Angeles International Airport (LAX) to John F Kennedy International Airport (JFK). Flight time from New York to Los Angeles (all airports).
So for example, instead of using 25,000 miles to fly business class from LAX-JFK and then another 50,000 miles to fly JFK-London a week later, you could combine both awards on the same itinerary and use a total of 50,000 miles to fly LAX-JFK have a stopover and then continue on to London at a later date of your choosing.