crontab question

[crnholio]

hi list,

i have a simple question concerning crontab. i would like to execute a program every day at 0:45 o'clock and kill it at 6:00. this is the entry i made in /etc/crontab:

45      0      *       *       *       crnholio    program
0       6       *       *       *       crnholio    killall -9 program

well, it doesn't work and i guess i haven't understood how to enter the exact time into the file. could somebody please enlighten me? :)

thanks in advance,
crnholio