Default [Q] What is the safe max temp for LG G2?

I checked this but I did not find it asked/answered here, I kept getting results of other devices.
I am running this modification my G2 and it seems to get hot pretty quickly. I have a case on it and I can feel the heat very easily, gauge is reading 103*F. I know this may not be too hot for other devices, I read 107 or more, but what is the safe temp?