$ PEEK/SAVE_SCREEN/LOG/REOPEN /MAX_REOPEN = blocks
                                 /NOMAX_REOPEN

   Specifies the approximate maximum number of blocks to which a
   terminal-logging file may grow before a new version of the log file
   is started, when /REOPEN is in effect.

   Use /NOMAX_REOPEN to specify that any default /MAX_REOPEN value
   should be ignored.

   The default value for /MAX_REOPEN is taken from the logical
   SAVE$MAX_REOPEN, usually defined by PEEK_DEFAULTS.COM.

   Example: $ PEEK/SAVE_SCREEN/LOG/REOPEN/MAX_REOPEN=100

   For more information, see the PEEK Commands SAVE_SCREEN Subtopic:
   /REOPEN.