Hello zBIGfish. There is no normal speed... just set the metronome to a tempo (what you tap your feet to) that feels right for what you're playing. If it's too fast, slow it down... if it's too slow, speed it up... experiment. When I use a metronome in my lesson, I tell you the speed (Solo Harmonica Study 1 for example... looking at Ex. 1.2, I state the speed you're to set it to). Does this answer your question?
Hello zBIGfish. There is no normal speed... just set the metronome to a tempo (what you tap your feet to) that feels right for what you're playing. If it's too fast, slow it down... if it's too slow, speed it up... experiment. When I use a metronome in my lesson, I tell you the speed (Solo Harmonica Study 1 for example... looking at Ex. 1.2, I state the speed you're to set it to). Does this answer your question?