Bound on the diameter of split metacyclic groups

Let $G_{m,n,k}={\mathbb{Z}}_m{⋉}_k{\mathbb{Z}}_n$ be the split metacyclic group, where $k$ is a unit modulo $n$. We derive an upper bound for the diameter of $G_{m,n,k}$ using an arithmetic parameter called the $\mathit{\text{weight}}$, which depends on $n$, $k$, and the order of $k$. As an application, we show how this would determine a bound on the diameter of an arbitrary metacyclic group.