"minutes" is currently hardcoded in autosave.js apparently for handling plural, see: https://github.com/xwiki/xwiki-platform/blob/stable-15.10.x/xwiki-platform-core/xwiki-platform-web/xwiki-platform-web-war/src/main/webapp/resources/js/xwiki/editors/autosave.js#L174-L178

We need to refactor all that to use a full sentence.