Sourdough Starter

[Adaline'sMama]

I am making my first sourdough. I bought the starter last week (9 days ago to be exact) and when I purchased it, I forgot to pick up the recipe sheet. So, I didnt know that I was supposed to feed it within the week. I fed it this morning, and seperated 2/3 out for the bread, kept 1/3 for the mother. The card says to let it rise 4-6 hours and it should double. I dont think it has doubled, and its been almost 6 hours. Did I kill it by not feeding it? Should I just let it keep going?
TIA!!!

[erratum]

yes, normally you have to feed a starter that's at room temperature every 12-24 hours. 

  Is it rising at all? I have a really slow sourdough starter (partially because I don't feed it before I cook) and it takes nearly 24 hours for me to make a loaf from start to finish. Here's how I make 100% whole wheat bread: I put all the ingredients in my bread maker on the dough setting right before I go to bed  (feeding the starter and putting it back after I'm done and just leave it alone overnight to rise.) Then when I wake up in the morning I shape it and cover it for the second rise and it isn't ready to bake until 5pm that night. I think that working with different sourdough cultures is individual thing and you can't really go by a time table. Just poke it and if it bounces right back it still needs to rise longer. 

  As long as you culture doesn't smell bad, you can try to revive it by feeding it (and dumping half out) every 12 hours until it's bubbly again.