When is the best time for a game to be announced?

[Lawlight]

flashfire926 said:

Who cares if the people say the series is dead.
It's not like that hurt fallout 4 sales in the slightest.

On topic, it should be announced a around 6 months before.
A lot of publishers are transitioning to a shorter turnaround.including Ubisoft Bethesda and Nintendo.

Sony and Square Enix have to step their game up on this matter.

Don’t Nintendo still announce several of their games well in advance?