What happens if a buyer never responds to my dispute response?

[obstrepherous]

I sometimes get a buyer that opens a dispute, and once i've sent a message back they never respond again. What happens after this? Does the dispute just remain open forever?

[kernowlass]

@obstrepherous 

If the buyer doesn't close the dispute then it times out 20 days post opening.

Up till then they have the option to escalate to a claim for paypal to make a decision on it.