He's taking it once every few days, if not every day, and I'd assume he just takes it every day.
Ibuprofen has no acute symptoms, yes, and isn't going to kill you in an acute fashion like Tylenol and alcohol can, yes. But it is the worst of the common pain relievers to take continuously long-term, as it has clearly understood mechanisms of disrupting the gut and causing damage. The producers of the drug have avoided doing studies around long-term effects, and focused on short-term ones where it doesn't show any harm. But ask any gastro about it and they'll tell you Advil is great for business, as long-term use (daily for years) is what gives them many of their patients.
Just like Tums. Yes, Tums. The studies all focus on short-term dosing, which is harmless. But taking it repeatedly for long periods of time (years) can have serious repercussions to the stomach and the rest of the GI system over time and should be avoided. For a time they were printing on their bottle 'do not take for longer than two weeks', but I think they fought to stop having to print this anymore.