How soon can i let my juniper bonsai tree have sunlight after sun burning it?

i have 4 juniper bonsai trees that i sun burned over a month ago and i dont know how long to wait to let them have sunlight or how much without causing more harm to them.They are looking better but have not ben in sunlight for awhile.If you have any suggestions or tips please help.|||They do not need direct sunlight.Is why they burned in the first place.Inside the house keep away from the window or place in a window that gets only morning sun. Outside keep in the dappled shade or early morning sun only.All day sun or afternoon sun is to hot for them.A product made by Miracle-Grow,called Mir-Acid is excellent for all evergreens that have been burned.Can put into soil and spray on plant.Use as directed.