Most sources say up to 5 days but I don't believe that.

I typically don't like it to sit in the fridge more than 24 hours. At that point I put it up in the freezer even if I know I'll use it within the next 36 hours.
Friday I pumped at work and left the milk all in the fridge because we had a wedding on Saturday. She did not drink all the pumped milk so I thought oh she'll drink it Monday. 3 days should be fine since most sources say up to 5 days. Well this morning I go to check it and it's all clumpy!! Ugh I wasted 3oz! I should have trusted my own instinct and threw it up in the freezer Saturday night.

How long does your pumped milk last in the fridge?