Throttling Mass PM's and Mass Emails properly?

[pythonimp]

I must be an idiot, but I can't do much marketing when I'm throttled to 500 emails/PM's per hour.

When I go into the mass PM/Email users function, I see "Throttle 500"

Would I Just have to click "Next" every hour or something like that? Or is there a cron job I can set up to throttle for me?

Detailed instructions would be greatly appreciated,

thanks guys!