What is INT_MAX value in ffmpeg?

This maybe a naive question, but could someone please tell me what is the value of INT_MAX as it relates to nvenc? In ffmpeg, the nvenc documentation makes lots of references to this, for example:

-rc-lookahead E…V… Number of frames to look ahead for rate-control (from 0 to INT_MAX) (default 0)

If this refers to the x64 architecture then the value would be 263-1. But it would be ludicrous to use that number of frames for lookahead. So what does this actually mean?