Star-forming times (left) and half-lives (right), both relative to the Class II half-life, inferred for protostars in all clouds as a function of evolutionary stage as presented in Tables 3 and 2. The clouds have been shifted horizontally for clarity, and are (from left to right): Perseus, Serpens, Aquila, Auriga/CMC, Cepheus, IC5146, and Ophiuchus. The average, when all stars are included, is shown as a shaded box, where the height of the box is the spread.