I know lots of guys that preload syringes, so I'm sure it's good for at least a couple days if kept in a dark and cool location. I wouldn't let it sit around for months though as it has been exposed to air which does contain bacteria. If you're just worried about taking 5 minutes to pin - you're totally fine and a slower inject = less pip. (usually)
Depends on aas and the base to it. Oil bases would keep their potency longer, however the concern would also be where their being stored and are they properly capped etc.. Keep in mind your injecting into the muscle (human body) so ANY bacteria can cause problems because they would not be sterile at this point. From experience i kept loaded for 2 weks with no adverse effects...
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