How can I do to Date and Time fields adding using ADO with SUM function?

Mytablo:Table1

Myfield:
Name=Times
Tip=Long time

Examples:

Times

12:35:40
21:40:50
03:05:25
18:39:17

SELECT SUM(Times) AS SumTimes FROM TABLE1

if total time > 1 day then Sum function invalid total make

What should I do?