set save_location to ¬Note that you can change the loop to whatever you want. You can even make it indefinite and specify a time to quit if you want. Read up on Applescript as there are lots of cool things like this you can do.
(choose folder with prompt "Choose where to save screenshots")
repeat with shotcount from 1 to 100
do shell script "screencapture " & ¬
quoted form of POSIX path of save_location ¬
& "screen" & (shotcount as string) & ".pdf"
delay (60 * 60) -- delay one hour
end repeat
[Editor's note: You'll have to save the script as a compiled application and then launch it, of course, in order for this to work. And as an aside, if you do something stupid, like setting the interval to "60 * .016667," (one second) you may find that you have to force quit the script to get it to stop ... don't ask how I know this!]

