How many to do items do you put on your list daily? How many on average get done?

So I have a todo list for various things, and every list has six items nothing more nothing less. And those six are organized on the basis of priority, so the urgent and important ones come on top. And until and unless i am finished with the first one, I do not move on to the next. On an average I finish five out of six. And the sixth one becomes the first one on next day's Todo list