How much direct mail should I send out

[Kortez Walker]

I would like to know personally how much direct mail should I send out atleast a month to get a good return. I've been doing investing for 2 years now but now alot of direct mail. I've alot of deals really just driving for dollars and contacting home owners on zillow. I now am an active broker in the indianapolis area and I would like to know how much an active investor does in direct mail to get a good return?