I have an item that someone wanted to swap for, but I requested a picture of what we would swap for before we were to go through with the transaction. She said she'd email me the picture that night. Three days later, I don't have a picture or any contact from the first person, but I have another person interested in the item. I've messaged the first person to ask what's going on with our swap, but how long do I wait before telling person #1 that I'm moving on?