As long as it tastes fine your ok. The hydrolysates are the ones that won't last long once mixed with water. This is because they are not stable proteins, they are predigested peptides and will begin to go sour after about 24 hours.
Sure, every food product has a "shelf life". For proteins it is usually about 2 years, if environmental conditions are kept within limits. You just want to keep your proteins aways from heat and moisture.