+1 for Jellyfin and Finamp but check out Audiobookshelf for podcasts and audiobooks. It even has regular checks for podcasts that you can set for rss feeds.

Mainly Selfhosted and Linux Unplugged.

Not as much as the ones above but also like to listen to:

• 2.5 Admins
• Late Night Linux
• Linux After Dark
• The Homelab Show
• Linux User Space

I can confirm that jellyfin continues playing until it is manually stopped. I once had it play for 12 hours straight without any interaction so I think it is fair to say there is no limit.