Well I am also growing an Afghan -- 100% Indica
I have had mine potted since March 15th (25 days old today I guess) and it is tiny. Although we did bury it deeper to make the stock stronger. At it's tallest point it is 4 inches. It has three sets of 3 leaves going on it's fourth pair. I'm hoping by now this is still helpful, even if as just a comparisson.