One hour into it...

I've only seen it once, so I cannot say for sure, but I'd be willing to bet that if you are an hour in and not interested at all, you probably won't be by the end either. I myself like these kinds of movies, but typically speaking, only if I was interested in the real life event in the first place. And I must admit, when the whole 'Tonya Harding/Nancy Kerrigan' thing went down, I didn't really care outside of the jokes; O.J. was much more interesting...

Even still, I found it interesting enough for a single watch. But I was just as interested an hour in as I was a half hour, as well as by then end.

Generally (although not always), the opening of any given movie indicates what kind of a movie that it will be, overall. I did not want to see "I, Tonya" at all, because I'd not only seen the trailer online, but know enough about the real-life Tonya Harding, the kind of person she is, and the whole sordid thing with Nancy Kerrigan that went down so that I did not want to see this movie, much less root for Tonya Harding.

The fact that Tonya Harding had a really hellish upbringing does not let her off the hook for her complicity in the sordid attack on Nancy Kerrigan ( i. e. Tonya's co--conspiring to obstruct the investigation and prosecution of Jeff Gillooly and his goons, which cost Tonya a promising figure-skating career, which it should have.)