The time it takes for underwriting to be completed depends on how your lender operates. Some will have an in-house underwriting department, and others will use a central processing center. If your lender has in-house underwriting, it will typically be faster than those who send their files out to a processing center. Other factors that may slow down the underwriting process could be the completeness of your loan application and whether there are any unusual items in your credit history that could require additional explanation. Your lender should be able to give you an idea as to how long this process typically takes for your type of loan.