Every thread has 15 posts per page. Once there are 16 posts on a thread, a second page will be created, and so on.
JerryLINY: I know exactly what you mean. If there's a thread with 58 pages and someone says, "Oh that technique is described on page 22 of "such-and-such" thread. You go to that thread, and then you can jump to page 3, then to page 4, then page 5, then page 6, then page 7 - until you get to page 22.
I have asked numerous times for this "jump to page . . ." feature in General (which they eliminated), Technical Support, Suggestions, PMs to Jackie, What Would You Like to See on the Revamped Site," etc. I got *no* responses and the feature never appeared. Obviously the owners do not intend for this feature to be added for the members to find certain posts or pictures. I feel your frustration. 
Quote by @%username% on %date%
%body%