Expand the "erase after (hour)" limit, to allow who need to let some news there for a month or more.

I like to follow gitlab issues (like this https://gitlab.com/comunidade-software-livre/gestao/-/issues.atom) and tasks from another services. This extension is just what I wanted to put my TODO list (from projects and jobs) on my desktop. However, 100 hours is too low limit to get some tasks done.

I think you also should consider to accept `0` as "never auto erase"