In one of my games there is a limit of 1000 ships and 15000 units. They are both very annoying because my build queue is almost always on hold. I even started to build kamikaze ships for that reason This is a 17 players DNM game currently at turn 164.
I've reached 1000 ships in the game where I had (and have) my all time biggest empire.
Btw it's pain to manage 1000 ships, at least in my 800 Mhz computer. It'll take about half a minute to open ships/units window You can expect that I won't open it very often Is that normal in such slow computer that I have?
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'The surest sign that there is intelligent life elsewhere in the universe is that none of it has tried to contact us.' Calvin and Hobbes
Are you tough enough to be the King of the Hill?
It is a pain, but I haven't seen quite that much delay in opening windows with my 1000+ ship game on a slower machine, but then I didn't have 1600, nor 800 bases.
Mainly I would avoid using the ships/units window, which I don't use very much anyway.
And of course, most ships were in fairly large fleets.
Still, it would take me over an hour to do a turn properly.