Say, for whatever reason, you want to bounce iphoto once an hour. You can do that with AppleScript and cron.

Copy this into ~/bin/bounce-iphoto:

#!/usr/bin/osascript
on appIsRunning(appName)
  tell application "System Events" to (name of processes) contains appName
end appIsRunning 

if appIsRunning("iPhoto") then
  tell application "iPhoto" to quit
  delay 60
  tell application "iPhoto" to run
end if

Then wire it up with cron:

chmod 755 ~/bin/bounce-iphoto
crontab -e

and add this line to your crontab (which may be empty):

0 * * * * $HOME/bin/bounce-iphoto

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