You should consider a private lesson from Riff Interactive like a private lesson from any other private teacher. You pay by the hour (or 1/2 hour) and ask for what you want to learn.
If you are looking for an exact transcription of a difficult solo, it will take a while for the teacher to figure it out. If you just want the basic chords, it shouldn't take long at all.
The difference is that you get your lesson in the Riff Interactive format, to keep and practice with as long as you want.