How much and how long can a body store vit.d? if i get tons of sun in the summer 3 months, and very little afterwards, does my vit.d last all year?

Vitamin D storage: The main circulating form of vitamin d is 25-hydroxy vitamin d. Its half-life in the blood stream is 2 weeks. When you build up your vitamin d levels during the summer, you can use them immediately as the blood levels are higher, and excess vitamin d is stored in your body fat, which can be released in the winter for use. Vitamin d can be stored in your body fat for several months.