Thor is mostly depicted as immortal in the comics. His immortality is tied to his divine heritage and the magic of Asgard. However, there are certain storylines where his immortality is challenged or put at risk, but he usually emerges victorious and retains his eternal status.
In the comics, Thor is typically immortal. His immortality stems from his godly nature and the magical forces that surround him in Asgard. Though he may face powerful foes and difficult situations that seem to threaten his existence, his immortality ensures his survival and continued adventures.