It depends on the type of kibble you are feeding. I would feed 4x a day at this age. There are usually guidelines on the back of the bag however they are just that guidelines. When I was feeding kibble I usually started on the low end of the guidelines then adjusted as needed for weight.
The best IMO if you can handle it is Prey Model Raw, however not everyone can handle it, I would feed Orijen (best kibble IMO), Acana or something like Honest Kitchen or Ziwi Peak. Granted those foods might be more expensive, but you will feed a lot less of it than some of the cheaper brands of kibbles.