Duration accumulator

I store on MySQL / MariaDB database a duration of type Time.

I read it from Databaserow this way:
Self.duration = row.Column("duration").DateTimeValue

I show the value on my list control this way:

Var items() As Entities.TimesheetEntity = Entities.TimesheetEntity.Read
Var list As WebListBox = TimeSheetListBox

Var acc As ?? //pseudo code

list.RemoveAllRows

For each item As Entities.TimesheetEntity  in items
  list.AddRow (item.duration.ToString(DateTime.FormatStyles.None, DateTime.FormatStyles.Short) 
  acc = acc + duration //pseudo code
)
Next
mylabel.text = "total duration: " acc.toString //pseudo code

My problem is how can I make an accumulator and display the total duration after my loop?

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