We sent out STD's 10 months out, Disney will send their STD's around 7 months out, and we are actually sending the invites pretty early at 4 months out.
We are doing this b/c we need to know who will be coming to WDW b/c we are also having an at home reception that people not invited to Disney and people who cannot make it to Disney will be invited to. Well, the location for the at home reception has a cap, and since it's the weekend after our Disney wedding, we need to know how many we can/ cannot invite. I am not sure if my rambling made any sense