How many times do send direct mail and scrip

[Chip Chronister]

I have started a direct mail campaign and I am wondering how long do I need to stay with a list, I am trying to find buyers with high equity and it is in better neighborhoods I have had more than avg calls but the ones I get is the one that want full retail it is depressing but positive how long do I need to do this campaign. Also how are you screening your people so you dont get a lot of junk calls thanks!