Next ninja event is 31days later

Is that true that we can keep the ninja we have for 31days and extra ninja that we purchase will last as long? 

Can someone confirm? Just worry that the day counter might change again later.

Next Ninja Event will start the 9th September. There will be a server update to change the date.

Why not set the real date in the first place… People could have bought gem for ninja and expect to have it for 31 days… Another bait and switch case?

The date will be setup with an incoming server update.

Since we had to delay the Ninja event, we have to reschedule it properly on the server side.

There has also been an announcement as soon as the event was over today: