How long should I wait

[gerbil]

Hi guys I was selling some gear and a user got in touch and we arranged a price and I was asked to give my details for payment as it was wanted
Now this was Friday
I've since had another user showing interest but can't get a reply or anything from the first user as I've asked if they still want it as I ve not heard anything since
The first user has been on line a good few times since then
So what should I do as I'm wanting to sell the item on a so I can buy something else as I'm on a one out one in rule
Any advice is most welcome