Can you use the Q magnets over clothing in a treatment setting or do the have to be directly on skin and how long is best to leave them on in a treatment setting?

You can certainly use them through clothing. The magnetic field passes through non-metal material like it’s not even there. The only cause for caution is if the clothing material is too thick, thus creating a separation of say 5-10mm or more between the magnet and the skin, which would significantly diminish the strength of the field and the therapeutic effect.