how to stop cron apt from using all my dialup bandwidth

[golfer]

What's the best way to disable /etc/cron.daily/apt so it doesn't take
all my dialup bandwidth when I need it most?  I have a bunch of
sources in /etc/apt/sources.list, and cron apt just took all my
bandwidth for about 14 minutes to update them.  I prefer to do my
updates manually when I'm not doing other web work.  As I scan
cron.daily/apt, it's not obvious how I can regain contol.  For now, I
just 'chmod -x /etc/cron.daily/apt', but this shouldn't be necessary.

I'm running a daily updated dapper-devel version.

TIA