I think that it should dry till the color fades toward a lighter green or even slightly gold color - maybe two or three months... I cut mine with the fat end about 3/8". I hope I am wrong, and it is hard to tell from your pics, but the bundle on the right looks like it might be a little immature to ever make good arrows. I messed up early on in my cane arrow building by harvesting cane that was too young. It will be too floppy and spine too light. I think it has to be another season older and take on slightly stiffer qualities. After you mess with it some, you will be able to look at it growing and tell the difference. Those leaves laying right along the stalk usually won't be present on cane that is mature enough to make an arrow. The good stuff usually isn't so bright green and it is tougher to cut down. There's my two cents.... That said, when you start making arrows out of it, you will be impressed how well it holds up and how accurate they are. Cane is good stuff. Oh, and cut them long, 34 or 36" and prestraighten them a little (bend them till they look straighter) and duct tape the hell out of them, about twelve shafts to the bundle, before you let 'em dry.