Along with Season 1 and Season 2 missions, there are also the Side Missions (S1-S3 at the moment), but there’s also RACE missions, which appear to be distance targetted instead of time targetted. These race missions range from 5K (approx. 3 miles) to 20K (approx 13 miles – this is also almost a Half Marathon distance.) It doesn’t appear to be available for me yet, but it may be because I haven’t completed my rerun of Season 1 yet (just finished Mission 15 out of 23.)
The distance missions would be perfect for my long runs.