Some of the advice is simple; some is very complex. It may take several days to develop the advice, including consultations with legal services and the commissioner. It happens quite frequently that it is not simple. When MPs get in touch with us, it's usually because they're not able to find the answer themselves. There's a degree of complexity in a good proportion of the requests for advice.
We also fully document everything we tell an MP or a public office holder, so we have a chance to consult it in the future when the same MP or public office holder consults us. We have to be consistent, and we also have to be consistent between office holders. Documenting takes time as well.