I would drive the 45min. to get it. Otherwise it may take 3-4 days to get it over the internet. Work up to 3 cups. But start out with one. You only need about 3cups per horse if in pellet form. I soak it first. Or start out with one cup shredded. I recommend soaking for 2 hours before you add grain and mix real good. Learned this from this forum(thank you very much)! I would say it should last a few weeks or more. If you want get two bags but store one in a cool area. I know having to drive somewhere sucks so if you can stock up on something, I do! Someone here will let you know about how much you will need. How much your horses weigh and such go into how much you will actually need. I know when your horses get to a weight you are happy with then you can cut back down again.