That depends on the lender and the amount of money you want to borrow. In many cases, lenders only perform a "soft pull" on your credit rating. This type of credit inquiry won't negatively impact your overall credit score.
In other cases, lenders may offer no credit check bad credit installment loans. That means the lender makes a decision on your loan application based only on the information you've provided, and you'll usually have an answer within just a few minutes.