Really depends on how much you're injecting and what's actually in the vial. My spouse started the same time I did, early January. Always run two vials at once. Started smaller, dosing at a low amount, getting five shots total between them. Moved up to a bigger vial size next, higher dose. Next round will be an even bigger pair, giving us seven doses each at a higher amount. What amount are you starting at, and what vial size?