How expensive is surgery for intermittent testicular torsion? and how much time is needed to recuperate?

Varies: Shop around to get the best rate, just like any other purchase. (i presume you don't have insurance). But, the condition you describe is potentially serious, and the surgery is fairly simple yet important.

Same...: The involved techniques and costs for either intermittent torsion or one-way full-blown torsion are about the same, but the full-blown one may at times pose some difficulty in deciding to fix or remove it.