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://forums.irealpro.com/threads/multiple-page-charts.6739/

But, keep this in mind:
PLAYER CHARTS vs. READER CHARTS
https://forums.irealpro.com/threads/new-users-start-here.13466/

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