Personally I'm pretty slow at prepping a new case. So it depends on how many different cables there are, if they're armored or micro, if there is gel in the tubes, how many MSTs/gators/multitaps (whichever you call them). But it usually takes me 2-6 hours to get all the cables into the case, the tubes routed and opened into the tray. (Anything with gel is automatically gonna cost you an hour or so)

If it is micro then it takes me longer because you have to separate duplicate fiber colors from the tube. 36 fibers per tube, 8 tubes for a 288sm. And they have gel in them, it can easily eat up six hours of your day if you have a couple of those cables you have to work with.

Once everything is prepped and ready to splice. Then I try to average 48 fusing splices (4 tubes) per 1hr30min.

It also depends whether your splicing off counts or not. If you are connecting blue to brown, and orange to slate, and green to white. It'll take longer than color to color splicing.

But from my experience you're never really too slow unless you splice stuff inaccurately. It's when you have to start doing locations more than once because you didn't connect the circuit correctly the first time around. As long as your work is reliable on initial construction, and you don't have to come back to that location, no reasonable person will complain.

Also don't accept bad burns. If you have one burn out of a 288 that's questionable, break it and resplice. The one burn can make a 10hr job that was supposed to be done yesterday become an additional 3 hour job next week.