HREFLang Builder’s XML Site Maps follow the same rules of any other XML site map. The SiteMap.org standards say you can have a maximum of 50,000 URL’s and must be no larger than 10MB (10,485,760 bytes). As you can imagine, mapping XML files to 20 or 30 country alternative variations the file sizes can become quite large. While you can have individual files this large, our experience suggests you should keep these files smaller at a maximum of 10,000 URL’s per XML site map. Accordingly, we allow you to set the size of your individual XML files.
The “Default” setting is 10.000 URL’s per XML site map file and when the files exceed that number a new file is created and appended to the index file automatically.