I have a sunburn from vacation. How long to keep using hydrocortisone?

Ibuprofen and aloe. If sunburn is mild and focal, Hydrocortisone twice daily for a week can help. I find that Ibuprofen orally 4 times a day, and frequent application of aloe containing lotion has best efficacy. If more severe, your doctor may add a prescription strength topical steroid and/or silvadene (silver sulfadiazine) to opened areas.