Help scripting open and quit application

I am looking for help to write a script to open and application, then quit it at a specifed interval and then loop the open and quit. In other words, I would like to open an application to run for 1 hour, then quit and restart the process 15 minutes later. Thanks for your help.

try this, save it as a stay open application:

property flag : true
on idle
	if flag then
		launch application "myFavouriteApp"
		set flag to false
		return hours
	else
		quit application "myFavouriteApp"
		set flag to true
		return 15 * minutes
	end if
end idle