Problems with Duration in table

Looker does not recognize the duration format for me even though it is that way in sheet and is configured as such in the added data sources.

Captura de Pantalla 2024-01-10 a la(s) 17.32.09.png

In Looker:

Captura de Pantalla 2024-01-10 a la(s) 17.40.14.png

This is the problem: the value of column 'Tiempo de trabajo' (dimension) is null:

Captura de Pantalla 2024-01-10 a la(s) 17.42.22.png

0 0 26