About 25 minutes duration time between 9 am and 11 am is okay because at that time the sun rays are neither too strong, nor too slanting. Sun helps to absorb the vitamin D from foods. I personally recommend strictly vegetarian sources of vitamin d like cheese, cow's milk, yoghurt, oatmeal, tofu

1hr are u serious. Daily 5 to 10min enough. Early morning/just after sunrise best time ~ 5-6am.

6am tob9am

30min in alternative day in a week between 7am to 10 am.take green vegetables and milk,soybeans,egg yolks.

Average requirement of sunlight     30 min 3 times a week      Between 10 am to 4 pm     Darker people require more time than         fare peoples .     Some tan is unavoidable     You may use sunscreen for face     You need supplements .     Aim for level of  50 -     No vegetarian food contains vit d            except some mushrooms    Need to have animal sourced food   Food alone will not be sufficient . Sunlight is a  must for healthy . There are other benefits also .