That's a hard question, to be honest... it usually depends on so many things :) like the amount of free time I have to work on it, and it also depends on how much I like the painting itself, because if I start hating the picture during the process it gets specially hard to finish it.
But I would say the total amount of time can vary between 1-8 months, and that's kind of sad hahaha
Haha! So the pieces you fall out with might take 8 months!