perhaps it really depends on the type of student visa, or the documents that you have coz, I know persons who lodge documents last dec 18 and 19 and had their results already last week of january. according to vfs, the estimated time is usually 30 to 60 days anything late than that maybe normal but, you should have asked why its taking so long for your docs, anyays, we need to wait and just hope for the best....
