It will take several hundred hours.
In my case ...... the Omens sounded very flat and 2 dimensional till around 400 or so hours. Also center image would change around from day to day.
They now have around 700 and the sound has really opened up. Deep and Wide
I came from maggie 12qr's and the Omens really do not give up anything in terms of stage width. In my room they have a deeper soundstage than the maggies and the height is about the same.
The BIG difference is the Omens have HUGE dynamics. I have an Anthem Integrated one...which I am using only the power amp section which have 4 EL84's per channel for 25 watts and also have the McCormack DNA-1 which is a brute.
They both sound great on the Omens. I actually prefer the DNA-1......or at least this week I do

Ken