2 or 3. reason i do it because i put oats and PB in my shakes to basically make a decent MRP, and sometimes a banana in there. very time consuming to clean and use the blender and take out all the ingredients 2-3 times a day.
so i just spend 15-20 minutes knocking it out in the morning so i have shakes in my office or for whatever i'm doing.
trying to become an organized/efficient bodybuilder and have all the shit have a minimal impact on the rest of my life. hate all the time i spend prepping and shit
when i buy more containers (i keep forgetting) i'll probably do it for two days worth. shakes taste fine for at least 36-48 hours if in the fridge