Yes you should use all three. They recommend morning, afternoon, next morning, or start with the afternoon session. It cannot be stored but is viable for 5 to 6 days - also it must not be put in the fridge, and before using it you should warm it up to body temperature in a pocket. The absolutely critical thing with AI is to get the timing right, only possible when you have watched heats coming and going every 3 weeks and know the exact pattern it will take the next time, and when, for each of the two pigs. If you get the timing right, they will be entirely co-operative and stand still as statues while you do it.