PFQuery *query = [PFQuery queryWithClassName:@"GrandCarousel"];

[query getObjectInBackgroundWithId:@"9Fo5FBABpL" block:^(PFObject *updatedWaitTime, NSError *error) {
    updatedWaitTime[@"waitTime"] = localGrandCarouselWaitTime;
    [updatedWaitTime saveInBackground];
}];}