If you don’t have 800k for in complete 6 month of Application (initial visa, extension stay) it might be better to change to OA, Main difference is : no 800k needed, but a Health insurance valid for one year is required.
In my case, both applications required additional documents or written clarifications.
In Penang (Malaysia), I waited 10 days, submitted the requested documents, and the application was eventually cancelled because it had been submitted while I was still in Thailand.
In Vietnam (Ho Chi Minh City), additional documents were also requested, but the application was approved after 5 working days, which seems fairly normal there.
So I’d say 5 working days is the minimum, but more time is definitely possible — it really depends on where you apply.
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