The first flush of beans is usually the largest and most varieties will give you at least another set before tiring out. Some I've tried were finished in as little as 3 weeks. We plant bush beans in succession, at least every month, so we can rip out the ones that are tired/diseased and have beans all summer/fall. Different varieties of beans have different lengths and widths, so what tastes best to you size-wise for a particular variety may vary from one to the next. Resistance to disease is a plus with some of them. Lots of different ones to try. Mmm...love beans.