Are you looking for a part time or full time job?
A column has a specific time slot or edition they write for, whether it is daily or weekly. The candidate should talk about what kind of column they hope to write as it fits in the job description, and should talk about whether their column fits best as a weekly one or a daily one. Typically those that make being a columnist their primary career and income will work daily full time, while those who are using it as a side job or a job for later in life may work part time.
"I am looking for this job to be a full time one. I am just in the height of my career and I have many people interested in what I have to say. Viewers are the ones who have encouraged me to become a columnist. Now I want to pursue my writing on these topics on a daily basis."
