You can run rest api on-demand basis if you want to disable above plugin job schedule!
GET
http://localhost:8090/rest/purgerecyclebin/1.0/content/list/space/key/{spaceKey}
$ curl -u "user:pass" -XGET http://localhost:8090/rest/purgerecyclebin/1.0/content/list/space/key/DT {"Total Contents":4448,"Total Pages":1770,"Total Page Versions":6608,"Total Attachments":2678}
DELETE
$ curl -u "admin:secret" -XDELETE \ http://localhost:8090/rest/purgerecyclebin/1.0/content/purge/space/key/DT/retention/days/20 done $