What happens when the dispute timer runs out?

I have another question but I don’t really want to open another thread. So here it is: This is another transaction, and buyer has opened a dispute and all and has yet to reply me back. I would like to ask, is it possible to prolong the dispute? The buyer claims he is on a 7 day holiday and it is not possible for him to send evidence, giving him the benefit of the doubt, im willing to wait for him until he reaches back.