Which is period of validity of images uploaded to prnt.sc/ server?

Hi,
I start using Spotlight for Chrome extension and I see that images are uploaded to prnt server
I have been using imgur for image uploading before and I see advantage of using
this site that the links are valid for several years. at least that I use this site.

Is there is a term of validity of images uploaded to prnt server ?

I asked about 5 days ago support of prnt server and still no answer on my email.
Maybe somebody know from your own expierence?

Thanks!