I am about to do the same thing. I am looking at about 6 hours for the project. Well 6 hours plus a day since I am also installing a new intake and need to let the adhesive set. If you are only installing valves and not an intake pump for each bag it will cut down the time. My math is below. Hope it helps. Also this is my best guess.
Change out intake = 40 min plus one day to seal.
reassamble intake with 3 pumps( one pump per bag) = 1 hour
drill holes for bags = umm 20 min per side X 2 = 40 min
run hoses to two new bags = 30 min
run vent and drain hoses = 1 hour
Pull floor = 20 min
run wires = 45 min. ( I take my time with this since I like my wires nice)
wire up pumps = 20 min
wire up switches = 20 min
The time it takes for me to go oo shoot what was i thinking = 30 min
Total project time = about 6 hours
This does not include prep of parts and building the system on my coffee table so i know what i am doing.
Hope this helps
2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill