Trial lessons should be shorter

I often help people with interviews they will have the next day, and these kinds of people usually just want one lesson to warm them up. They don't have an intention of subscribing. Also, we teachers don't make any money on the first lesson, so I am putting energy into a lessson for someone for 50 minutes, that doesn't really benefit me. I think trials should be maybe 30 minutes, or we should have the ability to make them that long. Preply gets paid, the student gets what they need, and the teacher gets nothing for their labor. A trial should be a preview, not a full lesson