The amount of carbs you take in is up to you and your body. I was taking in about 35 a day and never left Ketosis.
Right now I am taking in about 150 a day and taking about 2000mg of ALA and am still not out. I don't know what it is, but one day I wasn't in and I started taking the ALA and I was back in. Not turning sticks purple or anything, but still getting traces on them. Nothing better than a mod carb diet and still being in Ketosis