Aloa,
From the Skype interview, the next email to continue for Doha assessment comes after a week or 7 days. They'll send you an initial Interview date, if you are fine with it you can accept it as it is. Otherwise, You can advise your next available time(which I did). They will work it out, but confirmation of new schedule will take another 5 days.
After finishing the DOHA assessment, the result comes exactly after 7 days from the Sim ride.
Some candidates i met in Doha, who received the Passing result were placed automatically in the pool(320 pilots). In my case, I have 4 months waiting from my end of service to Joining date(Heavy Airbus).
For those B737 Captains eyeing for the B787 Capt position, like my fellow candidate he was told that 150 guys in the pool are ahead of him.( info based on 1st week of May'19)
DC