These often last longer in the fridge. Or give powdered milk a try. "Dried milk powder has a far longer shelf life than liquid milk and does not need to be refrigerated, due to its low moisture ...
Store in fridge. This is for ladoo and khoya sweets like milk cake, Mathura peda, coconut burfi, pista burfi, boondi ladoo, coconut ladoo etc. Sweets with ghee and dry fruits have a longer shelf life.