Whole Blood Donation How Often After Donating Whole Blood Can I Donate Platelets? What About Plasma?

How often after donating whole blood can I donate platelets? What about plasma? - whole blood donation

Today I donated blood at 9 clock. I know I must wait 56 days before the gift of another blood donation. But how long should I wait to give platelets? How long does it take to donate plasma? I also have another question: What is required: plasma or platelets? (I would like to donate double red cells, but I'm too small and not hard enough).