Who the hell is taking 15 minutes to do a supraclav? Geez, I went to a decidedly average (that may be generous) program, and I've never seen anyone but a new CA1 doing regional for the first time take that long. Three minutes from needle on skin for such a basic block is probably too long, but it's been years since I've timed it.
If your partners are taking that long, stop laughing at them, and teach them how to move faster. One of the reasons, I would think, to hire a regional fellow is to teach the partners faster/newer/better techniques in order to improve the entire group's collections and relations with the hospital and surgeons.
As for CRNAs, like intubating and lines, regional is a "monkey skill." Anyone can be taught how to do the procedure, and become quite good with enough repetition. One place where I used to moonlight was small, and the full-time CRNAs trained by the one anesthesiologist at the hospital to do things the way he liked them. Both of the full-time CRNAs were quite good at placing TAP and lumbar plexus catheters, as a result.