600TT for something a student pilot with a solo endorsement could accomplish. Traffic watch is good for side money...thats why I did it. If your looking to just do traffic watch to build time, take it from experience, it's really not the best way to build "experience". I know of two people, both with 135 mins, but only flew traffic watch to build flight time who were not hired at company's, while others with lower time but more useful experience were.....