  This paper gives an explicit argument to show strong boundedness for ${\rm
Sp}_{2n}(R)$ for $R$ a ring of S-algebraic integers or a semi-local ring. This
gives a quantitative version of a related abstract result in a previous paper
of the author. The results presented further generalize older results regarding
strong boundedness by Kedra, Libman and Martin and Morris from ${\rm SL}_n$ to
${\rm Sp}_{2n}$. Further, the presented results solve the question of the
asymptotic of strong boundedness for ${\rm Sp}_{2n}(R)$ for $R$ semi-local case
with an argument that immediately generalizes to all other split Chevalley
groups.
