Knocking on doors for leads and deals

[Devin Bost]

I heard from a friend who is a real estate investor who claims to have the most success by knocking on doors to find deals. 

Does anyone else here have experience doing this? If so, do you have any key tips to make this effort successful? 

Also, how many doors do you usually knock on before you get a lead, and how many leads before you get a deal? 

I'd like to get an idea of the time commitment that would be involved. 

I realize that it depends on the market, area, time, etc., but I'm just wanting to hear people's experiences.