[return to the red]

So I sold an item on ebay for a substantial amount on Friday, the purchaser is a new account and has yet to respond to any of my correspondence even though I have tried twice.

Couple questions:

1) How long should I wait to accept payment or hear back?
2) If I don't hear back besides giving someone negative feedback is there anything else you can do?

I don't want to let this item sit to long and want to get it sold ASAP