I always bubble mine for 24 hours. If you just use kelp meal you can stir it every once in awhile and soil drench or foliar. Never burned my plants with kelp with 1x a week.
Pretty much this right here, however if you want to take it up a notch look into a product called TM-7 by BioAG. It's great stuff and you only need to use 1/4 tsp or less of the stuff, just make sure you don't use it more than once a week.