  The stable torsion length in a group is the stable word length with respect
to the set of all torsion elements. We show that the stable torsion length
vanishes in crystallographic groups. We then give a linear programming
algorithm to compute a lower bound for stable torsion length in free products
of groups. Moreover, we obtain an algorithm that exactly computes stable
torsion length in free products of finite groups. The nature of the algorithm
shows that stable torsion length is rational in this case. As applications, we
give the first exact computations of stable torsion length for nontrivial
examples.
