How long will it take for a closed account to appear on your credit report if it is not a negative item?

That will depend on how frequently the credit reports to the credit buearos. Creditors may report monthly, quarterly or intermittently. If they are a relatively small firm, they may not report at all. You might want to ask the creditor when and to whom they report your credit information. Larger companies will have departments who specifically handle customer credit reporting.