From https://meta.stackexchange.com/a/92006/133693
Just to formally document the exact policies we have in place to remove old abandoned / dead questions, the Community user will delete questions in the following circumstances:
If the question is more than
30days old, and ...
- has −1 or lower score
- has no answers
- is not locked
...or...
- it was closed and migrated to a different site
... it will be automatically deleted.
If the question is more than
365days old, and ...
- has a score of 0 or a score of 1 with a deleted owner
- has no answers
- is not locked
- has a viewcount <= the age of the question in days times 1.5
- has 1 or 0 comments
... it will be automatically deleted.
These checks are run every week across all sites.
