Time script help sought!

[kpp9c]

so all the imput will look more like this now... ( no comments either)

tem_133, DAT_20, 7, 00:58:25, 01:15:50

Item_134, DAT_20, 8, 01:15:50, 01:32:15

Item_135, DAT_21, 1, 00:01:00, 00:36:15

Item_136, DAT_60, 3, 00:18:30
Item_136, DAT_60, 4, 00:19:30
Item_136, DAT_60, 5, 00:23:00, 00:28:00

Item_137, DAT_21, 4, 00:37:00, 00:47:00

Item_139, DAT_21, 2, 00:36:15
Item_139, DAT_21, 3, 00:42:15, 01:00:50

Item_140, DAT_21, 4, 01:00:50
Item_140, DAT_21, 5, 01:25:10, 01:26:35

..... snip...