It will take longer because the code that you write is less dense, but I don't see why it has to take that much longer. After all, anything that you can do in a high level language can be mapped into assembler. In a lot of cases the mapping can be fairly direct. You even have things like function calls, can create object oriented code, and so forth, without too much effort.
Most people like to dis assembler because it is hard and because it is time consuming. Well, it is neither. It is just a very unfamiliar language that takes time to learn, and you have to put yourself in a different mindset (you have to think much more discretely).
