How long can yellow belly turtles go without uv light?

Any and ALL Aquatic turtles need a basking light for heat and a UVB light for shell growth and proper health. A UVB light also helps with digestion of food and fish which will help ensure the happy and healthy turtle. If you can not get a UVB light you have up to 2 weeks before they show any signs of health problems. with out a UVB light they can loose their appetite, have shell and growth deformities and ultimately kidney failure which will lead to a very slow and horrible death. they can not survive with out it and having them near a window will NOT be sufficient due to the fact that the glass filters all UV rays.