cron (3.0pl1-127+deb8u2) jessie-security; urgency=medium
  * As a reasonable protective measure, crontabs are now limited to 1000 lines
    in length per crontab.
    The maintainers find it very unlikely that longer crontabs exist; however,
    if you do have a use case, please file a bug report with a brief rationale,
    and we will consider raising this limit.
 -- Christian Kastner <ckk(a)debian.org>  Sun, 10 Mar 2019 17:44:13 +0100