Hi,
No the 48 hours limit is hard-coded and cannot be changed through a filter or setting. This is done because the 48 hour limit is a news sitemap specification. You can read on https://developers.google.com/search/docs/crawling-indexing/sitemaps/news-sitemap
“Only include recent URLs for articles that were created in the last two days. Once the articles are older than two days, either remove those URLs from the news sitemap…”
I’ll consider this a feature request for the upcoming advanced version though 🙂