How many people to target with direct mail/postcards?

[Bradley White]

Hey BP members! I'm about to increase my marketing with direct mail. I've heard other investors say that they "hit" their targeted list over the course of a few months to 5 months. How many people (on average) do you target per month with your direct mail? (My budget is $1000/month). Or have you found more success with sending 1 direct mail piece to a certain list, then sending to a completely different list the next month?