six months? not a chance in the world.
there would be no walmart chain left after paying plumbers for working six months straight on one store!
this one will require some serious followup
It won’t be plumbers doing most of the work — various contractors needed to rip out channels through the concrete of the main floor, excavate, and rebuild everything afterward. Chain will no doubt include a remodel of these stores.
To do major concrete work to plumbing ... it would necessitate removing all the contents of the store’s merchandise ...requiring closing. HUGE problem.