What’s the ideal time to announce new OC and DC?

When you find the right one. Getting the right coaches is far greater than the timing. That said, it would be ideal to get a coach who is at a winning program, whose team is dominating in a bowl game on his side of the ball and the deal has been made before the game that he is going to LSU so that the announcers mention as often as possible to a national audience how he is going to dominate with LSU's talent at his disposal.

When you’ve found the right ones