Soras apparently can lay up to 12 eggs, sometimes even 18. All do not hatch at the same time and from some basic research, one parent might tend to the hatchlings while the other maintains the incubation.
So with that many mouths to feed (unfortunately, all will probably not survive to adulthood), there has to be a lot of "back & forth" to the food source. And then it's the Sora dash back to the door/nest to deliver the goods.
The photos below were taken on two days. Photo #1 through Photo #3 are of the Sora with what I believe to be some type of invertebrate (worm, perhaps?). Photo #4 & Photo #5 are the Sora with a winged insect.
There must be a tremendous amount of calories expended by one little Sora, as one small meal wouldn't go far among so many children and even the mate, if he/she is still sitting on the nest.
PHOTO #1
PHOTO #2
PHOTO #3
PHOTO #4
PHOTO #5