try this :
DECLARE @DurationSeconds INT
DECLARE @DurationDays INT
SET @DurationSeconds = 62110
SET @DurationDays = @DurationSeconds /86400
Select CASE WHEN @DurationDays > 0 THEN
Convert(VarChar,@DurationDays)+ ':'+
Convert(VarChar, DateAdd(S, (@DurationSeconds-(@DurationDays*86400)),0), 108)
ELSE
Convert(VarChar, DateAdd(S, @DurationSeconds, 0), 108)
END