Explanation

There is a limitation regarding the number of characters for the complete path of the Page (the Page name and the names of its ancestors). The path of the Page is limited to 768 characters. Therefore, the warning from the following image appears when creating a Page exceeding 768 characters. To solve this, you have either to choose a shorter name for the Page, or to try creating it at another location.

FAQ

Why is the path of the Page limited only to 768 characters?

The Page path is limited to 768 characters because, MySQL has a max size of 768 chars for the String type which is used to store a title.