There are a ton of variables. I've only had a couple shifts where I spend my entire day (8 paid hours) doing sales plans, and I think I knocked out 12 of them a day give or take. The most recent one was a non-truck day, store was open; I tied everything, did the pulls, stripped/cleaned, set, and backfilled in that order. Digging for the signage was a little more time consuming than I would have liked, though.
It also depends heavily on the product you're working with and what the SPLN consists of. ie: It'd take a lot less time to set a gatorade endcap than a soup/can endcap. In general, the less often you have to touch the product, the more efficient you can be