PDF is not HTML. PDF is a Page Description Language. At the root of a PDF file, you have an object named the Catalog dictionary. In this Catalog dictionary, there is a reference to a page tree. This page tree is a structure that contains references to every page in the file. A page is an autonomous element in the PDF. Suppose that you have a PDF with 10,000 pages and you only need page 10,000, then you can fetch that page directly without having to render the 9,999 preceding pages. This is a "raison-d'ĂȘtre" of PDF. Hence your question sounds very strange: it is inherent to PDF to have pages.
It seems as if you want to create a PDF with a single page, containing a number of tickets each measuring 10 inches in height. In that case, you have to create a large page on which you print all these tickets (note that this is a bad idea, but I'm merely answering your question).
You need to take into account, that there's a maximum size for a PDF page. This maximum is 14,400 for the width and 14,400 for the height. So if you want to create a single page for a large number of tickets each having a height of 10 inch, you can create a page like this:
Rectangle pagesize = new Rectangle(360f, 14400f);
You will be able to fit 20 tickets with height 10 inch (720 user units) on this page, not more.