During the creation of the virtual table, an exception occurred saying that the plugin execution should finish within 2 minutes.

ERROR: An unexpected error occurred from ISV code. (ErrorType = ClientError) Unexpected exception from plug-in (Execute): Microsoft.Xrm.DataProvider.Connector.Plugins.ConnectorGenerateVEPlugin: System.TimeoutException: Couldn’t complete execution of the Microsoft.Xrm.DataProvider.Connector.Plugins.ConnectorGenerateVEPlugin plug-in within the 2-minute limit.

By the occurrence of the exception, the reading of the next columns in the table was stopped, from a table with a dozen columns (in the database), a table of a few columns was created (in the dataverse).

I recommend extending the length of the plug-in's runtime, until all the columns are loaded, in my case it should be 10 min, but what about cases where the table has hundreds of columns? 

Issue is connected to article: https://learn.microsoft.com/en-us/power-apps/maker/data-platform/create-virtual-tables-using-connectors?tabs=sql#create-the-connection