KDS Root Key needs to be created everytime???

Hi Team,

I have a couple of Queries for Gmsa. Please help in below queries :-

1)Do we need to create a KDS root Key every time when we are onboarding new GMSA Account or this is one time activity ???

2)Its documented to wait for 10 hrs before using Gmsa , wants to understand the reason . If the Replication schedule is set to max 3 hours ,Cant I use it after 3 hours?