Tror det er nemmere at gøre noget ala nedenstående:
#Run this every minute unless /tmp/no_exec exists
* * * * * test -f /tmp/no_exec || /path/to/your/program
#At 10 past midnight, create /tmp/no_exec
10 0 * * * touch /tmp/no_exec
#At 25 past midnight, delete /tmp/no_exec
25 0 * * * rm -f /tmp/no_exec