@ailyas2 first of all congratulations for ur ECA, secondly I have been following this thread since last 06 months and found people like
@YPS @CNP and you who are always ready to help others and respond to their queries.
What I have realized from my case, there is no standard timeframe for IQAS. In some case they take only 02 days to change status from Assessing to Final Review (your case) and in my case its more than 20 days still stuck at that same assessing phase.
So what i consider, its just patience. You just submit your application and put ball in IQAS court, rest is upto them. If you call them or send email they will reply you with standard answer.