This is not recommended for prodcuction environment and as long as you have appropriate backup/restore strategy. In general Its not recommended.
Hope you also read the blog post i recommended.
However to your very specific case, you can copy the bean definition in your spring bean context file and override the number of protected days as given here: https://docs.alfresco.com/6.0/concepts/clean-content.html
or simply set following properties in alfresco-global.properties file and restart:
system.content.orphanProtectDays=14 #default value, change it as per your need
Also note that, deleting the orphand nodes won't reclaim the space unless you also cleanup "contentstore.deleted" folder. ContentStoreCleaner will move orphand nodes from /contentstore/ to /contentstore.deleted/ folder.
If you want, orphand files to be deleted completely without being moved to contentstore.deleted folder, add the following in alfresco-global.properties:
Note that, it is not recommended as long as you have appropriate backup/restore strategy in place.
(ACSCE, AWS SAA, Azure Admin)