Not sure if this is helpful, but to give more context around their versioning and build timelines, here are all the changelogs [1] which gives you the date they were released. The timelines between 5.8, 5,9 and 5.10 were very short. A new minor release drops every week and the major releases drop a few times per year.
[1] - https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/