So this is my zoo ive been working on somewhere between 100-200 hours on, not super sure but important is since the europe pack, so ive only been working on and of on only one zoo for the last 2 years.
Id say im an above average builder in detail and not super slow while building and i still have only coverd ~1/5 of the map (i outlined with sand) and i havent even completly filled in all that space i have build on.
My zoo currently has 32 habitats and 7 exhibits, covering 49 Species, so still quite the large zoo.
Nothing close to full map, not even in ambition as my plan is ~1/3 of the map once im done, but it also still runs smooth even with animals.