my dad raises bees. and he needs some advice about sugar water?

Image by Bill & Mark Bell
The raising of its abdomen and legs is a defensive pose as far as i can tell its a bluff they have no sting.

Question by Just me.: my dad raises bees. and he needs some advice about sugar water?
so he has these blue jugs that hold 50 pounds of sugar water, he wants to know how long the jugs will keep the sugar water good for and if there is a way to prolong the sugar waters goodness.

i know weird question.

Can you help? Leave your own answer in the comments!