Halon 1301

g will it take? What will be the last to reduce to safe levels, and how long will it take?

CFC-11
CFC-12
CFC-113
Carbon tetrachloride
Methyl chloroform
Halon 1211
1301

R-11 = three chlorines
R-12 = two chlorines
R-113 = three chlorines
carbon tet = four chlorine atoms
Methyl chloroform (1,1,1 trichloroethane alias) = three chlorines
Halon 1211 = a chlorine, a bromine atom
1301 = an atom of bromine

1301 will probably be first. Carbon tetrachloride will probably last. Can not say about the duration.