I want it about this long.
My plan is this: The last time I cut my hair short, I did it so that it would have time to grow out for my wedding. It did. I also know that I will want it long when I have babies. So I am still growing. When I grow my hair I keep it dark to keep it healthy, when I cut it I color it blond. Then I usually keep it lighter until I decide to grow it out again. Then as it gets longer I gradually color it darker. So the "plan" is more of a common sense thing to keep my hair healthy since I want it long.
Not everyone has to have a plan but it is good to keep the health of you hair in mind before you make your decision to color you hair. Before you decide to be a platinum blond please consider the length and health of your hair. If you do decide to go blond from a dark color, also consider a hair cut. If you don't want to cut your hair just yet maybe the color should wait until you do. Your hair will thank you!