Yeast starter time

This will be my second yeast starter. The first one came out great, but I'm doing a bigger beer this time. The first starter I made was 4 cups of water and 1/2 cup of DME. (Per White Labs website) for a 1.045 Amber.

This time I'm making a 1.064 beer. So I went to Mr. Malty. It says ill need about 7 cups of water for this starter. I then used this: http://brew.stderr.net/starter_wort_calc.html calculator to determine the amount of DME to use.

So is 7 cups of water and 6 OZ of DME right? I do not have a stir plate, ill be using a growler and intermittent shaking.

The beer is NB Dead Ringer IPA All Grain.

If you have a hydrometer or refractometer, just use one of those... As long as your starter is above 1.030 you'll be fine. More yeast is always better!