While waiting for my 670G pump to arrive the doc gave me a script for a months worth of insulin. She wrote the script for 300 units a day. Which is very close to what i currently use with pens. The pharmacy gave me 6 vials. According to my math that's 6000 units. If i take 300 units a day and if iuse every drop and don't waste any that's only enough for 20 days. Correct?