After getting diagnosed with ADHD last year at 32 a lot of things in my life made sense, including why I tend to focus on whatever I'm interested to the exclusion of almost all other things and just get into things way, way too intensely. There is no getting a little bit interested in something and just engaging with things casually for me. If I get into something it gets extreme. That can last 3 days, 3 weeks, 3 months, or 3 years. I tend to like it when it's 3 years as the short duration hyperfocus tends to lead to a lot of impulse buys related to the obsession that then become useless once I'm no longer interested. The times when it goes for years I wind up outstripping my peers as most noone can match the time and intensity I put in.