Wondering the same if I ever have to do it. I am mechanically inclined and have decent tools. I suspect that for a DIYer, never having done it before, you'd be looking at a LOT of hours. My understanding is that there is a pretty thorough dismantling of the front end just to get to the engine. That alone (disassembly/reassembly) is probably many hours. Then there's the engine bits. I'd earmark 15+ hours to be safe and assume that car is our of commission for a couple of weeks. But it's just a guess. I'm assuming of course, detailed instructions and necessary tools.