I go by the time allocated on the ebay or Reverb listing. That's up to 5 business days. I've sold things and had people reach out in less than 24 hours asking why it hasn't shipped and I'm not going to lie it does annoy me. I usually have everything ready to go but I work nights and my only time to sleep is during normal business hours so it takes me sometimes 3-4 days when I'm off work to be able to ship.