MrsTittleMouse
There are a few fairly specific situations where it would be better to have an instrumental than a c/s purely from a time factor.
A crash c/s can be done very quickly, but in most situations it will not be less than 10 mins, as there is the physical transfer to OT, cannulate, pre-oxygenate, administer the GA and intubate and catheterise, plus a minute or two to get baby out. Forget the shave and a quick splash of cleansing fluid will do to cleanse. If you are fully dilated and baby has been well into the birth canal, a midwife may even have to put a hand into the vagina during the c/s to actually push the baby back up into the pelvis.
Obviously the risk of complications such as bleeding, infection, 'collateral damage' to other organs increases significantly with such a quick prep and c/s and if the alternative is a forceps delivery, in most cases that would be better. If the woman is pushing, a forceps can be done between a few seconds and a couple of minutes.
Specific examples I can think of are - severe fetal distress while pushing for example an abruption, if the babys FH is 50-60, 10 mins can be the difference between a damaged baby and a healthy one. Another example is a cord prolapse when pushing.
If you get to fully dilated and baby has descended well through the pelvis, an instrumental will be best for most women, however, with hindsight, sometimes a c/s would have been better.
Please dont take this the wrong way, as I know from your previous posts that you are someone who would have been better with a c/s, and Im just trying to answer your opening question!