When and how the mock removes the build directories under the "/var/lib/mock" in koji building hosts

[peng chen]

Hello, fedora-buildsys-list:
Recently, one of my building hosts's mock directory usually be filled with
build directories, I wonder why the build directories of finishing building
task not to be removed immediately for make room for the coming task , yet
they don't stay here untill some time elapses. So, When and how the mock
removes the build directories under the "/var/lib/mock"  in koji building
hosts?
Thanks!
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