There was a report that the must-gather took 5 hours to be generated. Upon inspecting it we can see that the sos-reports folder is 64GB for 9 sos.
Inspecting the sos we can find that the journal is 5G and contains logs since 3 month.
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There should be the possibility to pass parameters to limit the size of the logs to collect.

 --journal-size JOURNAL_SIZE limit the size of collected journals in MiB

right now sosreport gets runs always with --all-logs
https://github.com/openstack-k8s-operators/openstack-must-gather/blob/main/collection-scripts/gather_edpm_sos#L70