1) I know that when you are milking you don't want to let milk go back upwards from the teat into the udder, so you need to keep a tight hold on the top of the teat. What happens if you don't always get all the milk squeezed out of the teat with each motion? When you release the teat to let more milk down into it then there may still be some milk in it. Is that bad? Do I have to make sure I really get all the milk squeezed out each time I squeeze the teat? 2) Also, when I think I'm done milking I can always get some more milk from each teat. I think I could sit there all day and milk if I keep massaging their udder and then squirting again. At what point can I really know that they are milked out? What happens if I don't get them completely milked out on one milking?