How often can a Horcrux ability be used, and can you play a Horcrux card on another hero's turn?

Question

Accepted Answer

Most Horcruxes can be used once per turn, as each card states; Nagini is the exception and can be used once per game. Horcrux cards can be played only during your own turn.

Harry Potter: Hogwarts Battle

How often can a Horcrux ability be used, and can you play a Horcrux card on another hero's turn?