100644 blob c59b8e0bf27b389a7210f1d281d4529a85c19123	duration.cc
100644 blob 1a42ac3e63f98d2f34a73997e5ee2621ac478821	duration.h
100644 blob 7c07a722c4255ca46d1b290870897cb37a2978a5	duration_test.cc