You’ve only added two lines – why did that take two days! ~ Matt Lacey
The above is a great read and another aspect of providing support. In this case, the premise is “fixing a bug” and getting it right the first time.
Ideally, every time you have an interaction with someone in support you will be able to provide them with a solution in your first response… and sometimes that may take a bit longer than usual but most of those times getting a solution will be much more appreciated than a quick response prolonging the support request.