Low voc oil based kilz. Original? Red label? Voc's have nothing to do with how something smells. If you're using the product i'm thinking of, use with LOTS of ventilation. It is full of acetone (no voc's the vapors are heavy and fall vs. Rising into the ozone) and it's a doozy to work around for any length of time. You'll be fine, if you can handle a cat box (ammonia), kilz won't be much different...
As for when you can return to your space-- in a few hours. Do the priming in the morning and give it all day to air out and dry. The acetone makes it dry quickly, and if you're not too chemically sensitive, sleeping in your room that night shouldn't be a problem.
As for when you can return to your space-- in a few hours. Do the priming in the morning and give it all day to air out and dry. The acetone makes it dry quickly, and if you're not too chemically sensitive, sleeping in your room that night shouldn't be a problem.