Now from 2017 they will conclude all the cases with in 12 months of timeframe, whether they want to check genuinity of relationship or background check or conducting interview. I think the Visa officer come 4 times to conduct four sessions of interviews to Pakistan.
They only case which is excluded from 12 months timeframe is when someone has criminal background, has some kind of immigration violation in any country, or anything which cannot be verified through straight channels.
otherwise all cases has to be finalize in 12 months time period.
previous years 2014 and 2015 applicants are still hanging for their decision while we can see alot of decision of 2017 already done.