I always preload my weeks shots... five days is no problem. I store them in a dark, dry ,cool place in my house with the cap on and the pin up. I have found a syringe from a previous cycle that I forgot about....it sat in the syringe for about 6 months, lol... Obviously that would be stupid if I shot it. The black rubber stopper looked cool...it was all puffed up like a marshmellow. I should have taken a pic of it to show yall.
But yeah, 5 days is no problem as long as it was in a clean place with the cap on and you replace the pin before you shoot. Have fun my friend.