I started writing a "oh, I never found it that difficult" comment. Then I thought to test my own belief and tried to type out a cron schedule for "run this every hour", and... Well...
As well as the already-mentioned `n * * * *` solution, there's also dropping a symlink in /etc/cron.hourly to the program to run. Or a 2-line shell script if you need to add command-line params. (The other line is the shebang.)
The cron.hourly directory is a non-standard Linux concept provided by run-parts. The FreeBSD equivalent is periodic, but that's really for system tasks and doesn't have anything more granular than daily.
