As of a few years ago I can confirm that. Don't need (as stated by GP) to be active for years, at least, depending on how much and what/where/when you post. Being the first reasonable-sounding or insider-knowledge comment on a new article that then becomes popular gets you ~1/7th of the way with 2 minutes of effort per attempt; being the first to post from an RSS feed of a here-popular blog can get you +500 points in a single go. Just posting regularly, not doing anything special to farm, will get you there in a few months