Hello @Ala,
and welcome to KNIME Community!
In case you haven’t figured out it yet you can add timeout as parameter in the JDBC Parameters tab of connector node. See here for more:
https://docs.knime.com/latest/db_extension_guide/index.html#jdbc_parameter
Additionally in above linked document you can find more info about Database extension together with example on how to connect to BigQuery in Examples section.
Br,
Ivan