A new version of the sunpy core package is released twice a year, with target release months of May and November.
Versions x.0 are long term support (LTS) releases, supported for 12 months until the next LTS release.
Versions x.1 are non-LTS releases, supported for 6 months until the next LTS release.
Bugfix releases (versions x.y.1, x.y.2, etc.) are released monthly, with a target of the last Friday of each month.