You can, but I don't recommend it and this is why. Dose of hCG is very individual and is important to both experiencing the least hunger and best weight loss - if you pre-load your needles you will not be able to effectively adjust your dose of hCG as necessary - both at the start when you may not be sure what your best dose is just yet, and then once you find it, it's common to need to reduce your dose as you get thinner - so I prefer to leave the hCG in the bottle and draw up the hCG each on the protocol so I can have control over how much I'm injecting and have that ability to adjust as needed.
It depends on you as only you know how much weight you wish to lose. A single bottle of HCG drops (1 oz) helps in losing around 7 to 12 lbs. The time it takes is a month on average. Therefore, if you wish to lose 50 lbs then we strongly recommend following the diet for at least 4 months in a row. Yes, you need to follow in a row as only then you will be able to lose weight. Skipping the HCG diet every month will throw your system to into chaos as it will forced to choose between fatty food consumption and low calorie consumption. Therefore, before starting your HCG diet plan it accordingly and decide for how long you wish to be on the diet and how much weight is needed to be lost.