How long does it take to convert from ca final old course to new one? i need to fill exam form too!?

The last date of conversion from old to new scheme for Nov-2018 CA exams was 01.08.2018 which was later extended to 04.08.2018.

Since, you said that you filled the form 2 days back; it means that you have missed the deadline of conversion for Nov-2018 exams.

So, now the issue here is, as you have converted to new scheme after the deadline, it means that you have to give Nov-2018 exams under old scheme. But please confirm this point with ICAI-Exam helpline.

Last date of conversion from old course to new course, for Nov-2018 exams, has been extended again till 04.09.2018 vide ICAI Announcement, dated 20.08.2018 https://bit.ly/2N3yH5g

It takes about 15 days to get converted assuming fees for conversion is verified and confirmed. However, If conversion doesn't happen in such time then use ICAI e-sahaayataa, 

Procedure:

Signup .> Post Grievance > Category as Regions > Region as applicable to you > Activity as Help Desk > Follow further as guided and narrate your grievance.

In about 2 days you should get a follow up reply, and about 3 days you should find yourself registered.

Any further information. Please PM.