Link. 0. For getting an official approval for a loan would take 3 – 4 working days to be underwritten. I’m talking about 3 -4 days only if all your documents are completed and fit according to the wants. Else, it would be a long procedure, as the process is going start away from a new end.ink. 0. For getting an official approval for a loan would take 3 – 4 working days to be underwritten. I’m talking about 3 -4 days only if all your documents are completed and fit according to the wants. Else, it would be a long procedure, as the process is going start away from a new end.