It really depends on the picture as to how long it takes to complete.
I am not the fastest drawer out there i must admit and being a perfectionist doesnt help..lol.
I dont think there is one picture ive done that i can actually say i like and thats probably why a lot of my stuff is unfinished, i give up trying to get them right.
I can draw other horses, although i havent done so in a long time. Its just that i havent had the need to really, i only draw for myself and i love arabians so much it seems to be always those that i draw..lol.
I used to own an Appy years ago, his name was Khemosabi, his sire was American i believe. I would of loved to of drawn him but i cant find any photos of him. He was beautiful and he taught me so much. He really was the best horse and he was my friend, i miss him.