duration of scan

MalwareMultiScan.Scanner/Services/ScanHostedService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Threading;
 using System.Threading.Tasks;
 using EasyNetQ;
@@ -61,6 +62,10 @@ namespace MalwareMultiScan.Scanner.Services
                 Id = message.Id,
                 Backend = _backend.Id
             };
+            
+            var stopwatch = new Stopwatch();
+            
+            stopwatch.Start();
 
             try
             {
@@ -80,6 +85,12 @@ namespace MalwareMultiScan.Scanner.Services
                 _logger.LogError(
                     exception, "Scanning failed with exception");
             }
+            finally
+            {
+                stopwatch.Stop();
+            }
+
+            result.Duration = stopwatch.ElapsedMilliseconds / 1000;
             
             _logger.LogInformation(
                 $"Sending scan results with status {result.Succeeded}");