the limit of the iQ-VIEW / K-PACS database is set to 10.000 studies. You can also find this information in the iQ-VIEW Administration Guide (chapter 7 Maintenance). However, since iQ-VIEW / K-PACS are viewing stations and not ment for archiving images, this limit should never be reached. For archiving images you would need to setup a PACS (like iQ-WEB).