The half-life of a zero order reaction $\mathrm{A}⟶\mathrm{B}$ is

T 2 1 provides the zero order reaction's half life.
​$t_{\frac{1}{2}}=\frac{a}{2k}$
​where "a" is the initial reactionant concentration.
The starting reactant concentration is directly proportional to the half-life of a zero order reaction.