Fix elapsed time calculation in import scripts

inventory-server/scripts/import/purchase-orders.js

@@ -262,7 +262,7 @@ async function importPurchaseOrders(prodConnection, localConnection) {
             operation: "Purchase orders import",
             current: processed,
             total: totalItems,
-            elapsed: formatElapsedTime(startTime),
+            elapsed: formatElapsedTime((Date.now() - startTime) / 1000),
             remaining: estimateRemaining(startTime, processed, totalItems),
             rate: calculateRate(startTime, processed)
           });
@@ -276,7 +276,7 @@ async function importPurchaseOrders(prodConnection, localConnection) {
       operation: "Purchase orders import completed",
       current: totalItems,
       total: totalItems,
-      duration: formatElapsedTime(Date.now() - startTime),
+      duration: formatElapsedTime((Date.now() - startTime) / 1000),
     });
 
     return {