there are 6 levels. so presumably level 0 is people who started (ie requested) but did not complete level 1.
a level is a day or two of work, in my experience (unless you get stuck and need to sleep on something, or get entertained and go off exploring something), but i doubt most people are doing them full-time, so timing data is going to reflect mostly how busy they were with other things.
Yeah, I've been at level 1 for quite a while, but that's because I haven't had much time available to spend working on it. When I get some time I try to work through one of the problems. Of course, I'm also doing it in Rust, so add in the extra time of learning a new language (especially one still in flux).
a level is a day or two of work, in my experience (unless you get stuck and need to sleep on something, or get entertained and go off exploring something), but i doubt most people are doing them full-time, so timing data is going to reflect mostly how busy they were with other things.