I think that a dedicated builder will always be faster with the standard kits than the QB. The only kit that I think I would have got through quicker with a QB was the canopy, which doesn't have a QB option. I tried to build 3 days a week for 1.5-2 hours per day. Some weeks I built more and others less. A week or so off is the worst, because then you spend an hour figuring out "Where was I?" instead of building.
I ordered the Empennage, Fuselage, Finish, Firewall Forward, and Wing kits in that order and generally built in the same order. Unlike earlier planes, the RV-14 does not ship full-length longerons in the wing spar crate, so you do not need to get the wing kit to build the fuselage.
Here are the relevant dates for my kits. "Substantial completion" is an arbitrary date I'm picking now based on my build log spreadsheet, for a point when I seem to recall there not being any more work to do other than hooking the assembly up to something else, like wing installation (which was an easy afternoon). I also have not done the gear leg fairings or wheel pants, so those could add another 5 or 6 years to the finish kit if they turn out to be a nasty job like the canopy.
Empennage ordered 1/4/2018, shipped 1/8/2018, began work 1/19/2018, substantial completion 7/29/2018 (6 months)
Fuselage ordered 2/20/2018, shipped 4/16/2018, began work 5/3/2018, substantial completion 12/20/2018 (7 months)
Finish kit ordered 10/5/2018, shipped 12/10/2018, began work 4/2/2019, substantial completion 10/24/2019 (7 months)
Firewall forward kit ordered 3/29/2019, shipped 4/3/2019, began work 4/23/2019, substantial completion 1/21/2021 (21 months, but long break while working on other kits and wiring panel)
Wing kit ordered 5/3/2019, shipped 7/11/2019, began work 10/22/2019, substantial completion 8/24/2020 (10 months)
The wing kit was the one I probably worked on the slowest in terms of finding time to build. My helper got married and had two children during the build, and he is a Proseal expert so I really leaned on him for the fuel tanks (with great results) plus the wing skins are hard enough to rivet with two people, I can't imagine trying to do them solo. If you have consistent help, you can easily beat my time on that kit.
I hope this information is helpful for those debating whether to order QB or not.
P.S. Don't call the RV-14 non-quickbuild kits "slow build" around anyone who built an RV-4 or RV-6. They will justifiably punch you in the face.