"but do we practice all day long? what does one do with ones mind all day long?"
Your mind functions on a kind of auto pilot, operating according to your genetics, experiences and habits with some conscious input from time to time.
Each day it encounters some fresh problem or obstacles. Like a calculator performing a math problem the inputs of the situation will be sent through the brain's mechanism to produce an 'answer' in the form of the signals your mind outputs, namely thoughts, sensations, speech, actions etc.
The great feature of your mind is it has a function where it can look back at itself and adjust its programming to meet evolving conditions.
As you go through your daily activities you can identify some area of your mind's operation that you would like to change and simply think about and contemplate it until you get some result.
For instance: I was always very opinionated and ready to argue and debate everything, after a while I wanted to change so I made up a little game. I would listen to radio programs like Christian broadcasting or Rush Limbaugh that normally I would strongly disagree with and try to keep myself calm and just listen in an open and neutral way. At first I had to shut off the radio after a few minutes, but later I got better, and I would challenge myself to see things from the other persons perspective, contemplate what things in their life led to their views, and find some similarities between us on so on. It was something simple, and I could do it during work so it was convenient.
The positive benefit of my practice was that I was calmer, more patient, more loving, and could enjoy a better relationship with my friends and family, and not let views I didn't like cause me to become angry.
There are a lot of practices like this. Small things that piss you off, or scare you, or frustrate you happen all the time, you can find a way to use any of them to practice all day. The idea is to train your mind so that those things no longer affect you in a negative way and then you can enjoy the benefit of being happiness and wisdom