/etc/cron.d/john is in john 1.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #
# Start john everyday at the same to try to crack the passwords. The
# second line will then later stop the process so that it doesn't
# consume system resources that are needed otherwise. You are
# encouraged to change the times.
#
# Also notice that John is 'nice'd, if you don't like this (you
# believe that your system can run fine with john doing its work)
# just remove the 'nice' call
#
# JOHN_OPTIONS = foo bar (man 5 crontab)
#
#00 1 * * * root [ -x /usr/share/john/cronjob ] && nice /usr/share/john/cronjob start
#00 7 * * * root [ -x /usr/share/john/cronjob ] && /usr/share/john/cronjob stop
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