If it's frivolous then it quickly begins and quickly ends. If it's not frivolous but is complicated, then that's obviously going to take more time. On its face, if it's frivolous, if it's vexatious, if it's all of those adjectives, which have been used for years in describing people's access to the courts and so on, then it's over soon.
But there has to be more than just a fly-by or an indication on a gut basis that this thing sounds crazy so it must be. We do things that will allow us, as far as we can, to find out quickly if there's anything to it.
What we do almost immediately when the short process has happened is to write to the person and say we have made some preliminary inquiries and ask if they have any more evidence. Is it just suspicion? Is it something else? Give us everything you've got if you want us to decide at this stage whether we're going to take it further. If we can't be satisfied that there's some reasonable, probable grounds for doing so, then we're out of there.
That has proven to be successful. People who are serious, and who have what they think is a serious complaint, will follow up very quickly.