My mac can handle....well; I haven't really tested further then 70,000.
Sometimes it can handle 80,000 but it doesn't let me look up to the sky very high.
I would suggest adding 5000 then testing, then adding another 5000 and so on. One your FH crashes you know that that width is too much. So keep taking away 1000s until it doesn't crash during the test. Keep net f the one before or after it so you now where to start.
That's what I do anyway.