Most lessons are given weekly for 30 minutes each. Adults and more advanced students might get more out of 45-minute or one-hour lessons.
I find that students benefit greatly from personalized, one-on-one instruction, so my preference is to give private lessons. However, occasionally a family really wants to learn together (parent and child, or two children, for instance). If so, we’ll talk about it and see if this will be a good fit. In that case, a 45-minute lesson will be necessary and priced accordingly based on the extended time and multiple students.