Yeah, when I started work on the map I'm making (working on it here and there), I figured on at least 300 work hours, given that I wanted to do a bunch of new things, like rivers between spawn points, quadruple spawn battles.
One of the coolest things, in my opinion though, will be bases and the spawns into them being separated by water, and connected by causeways, or bridges.... or not at all. Would be interesting to need an LVT to take a base when you're not off a CV.
But yeah, point is its ludicrously time consuming.