I am impressed with KWSP as it has speed things up a lot compare to many years ago. I got my cheque like 2 weeks after submitting my documentation. It should be fairly fast if all your documents are in tact.
If you want to speed up the process of getting all the documents without hassle, you can request the bank where you get the loan from to assist you. They charge a nominal fee. For HSBC, it is RM50.
Papers required for loan reduction are:
The KWSP website is very informative and you can find most of the forms there.