A recent article from CIO Magazine discusses the recent surveys done by Forrester and Evans Data Corporation.
According to the Forrester Report (sponsored by BMC), the average time to resolve an application problem is 6.9 days for enterprise developers and 6.7 days for software vendors.
The EDC report surveyed the open source communities and found that the average time between discovery and solution of a serious bug is under 8 hours for 36% of open source developers! However, 57% of open source developers say that typical (not serious) bug fixes take more than 2 days.
I recommend reading the article by Esther Schindler. She gets into all of the complications that enterprise developers have to deal with such as meetings, prioritization, meetings about meetings, etc.
It is a worthwhile read.