Currently iReal Pro charts are limited to a single page containing a maximum of 208 spaces (12 lines (systems)).

For short songs,  you might squeeze more than one song onto a single page.
https://www.irealb.com/forums/showthread.php?6739-Multiple-page-charts

But, keep this in mind:
PLAYER CHARTS vs. READER CHARTS
https://www.irealb.com/forums/showthread.php?2157-BEGINNERS-start-here&p=25854#post25854

Currently, iReal Pro can only play one page between restarts.