I really enjoy the length of my hair now that I got rid of my thin ends. It's nice that's it's growing out without me thinking of when I need to get rid of those thin ends. Still, I don't think you necessarily need to get rid of all 3 inches at once. Why not cut 1 inch this month, another inch in another month, and then the final inch if you feel you need to ease into it. If you don't think you'll miss the length, then I'd say go for the 3 inches...esp if you've established a regimen that will help your hair grow without thinning (splitting, etc).