Ofcourse it does, but i doubt you’ll reach it anytime soon with a normal game. “Len” returns the length as Int32(which is a little flaw in my opinion since length/size can not be smaller than 0). Deriving from it, that it supports the full 31 Bits of the positive space of Int32, you can create a string with up to 2.147.483.647 characters. IIRC a TChar is 1 Byte, this means a FString of roughly 2GB(!). Nothing beyond this is possbile, because otherwhise Int32 will flip to negative value.