Type conversion - bigint to timespan

[timmac-qmc]

I can't find any documentation about support for type conversions.
I need to bind a MudBlazor TimePicker to a timespan variable, this would normally be stored as a bigint in the database and converted by EF
see: https://stackoverflow.com/questions/17129795/storing-timespan-with-entity-framework-codefirst-sqldbtype-time-overflow

EF can do this conversion automatically with annotations but I can't find a way to tell efg to add this to the generated model

[Column(TypeName = "bigint")]
    public TimeSpan Span { get; set; }

Any help would be appreciated.

[timmac-qmc]

Nevermind, worked out setting database type to "time(7)" lets EFG create a timespan field.