Argyle King
Legend
Hiding isnt an ongoing action.
However, if a character successfully hides in one location, but then moves to a different location, it makes sense to need to try hide again.
They've already gained the invisible condition with the first hide.
It would make sense to me to extrapolate that the character only be Invisible in relation to the target against which they were attempting to hide, but that would also be a houserule and not something currently supported by the text.