More than you are sure you will be able to liquidate on attempt 1 or day 1? That's pretty stifling. For most of us, I think that would be phrased "more than you can float in a worst case scenario". There are usually expensive ways to liquidate in case of emergency (PayPal, ect), but obviously people would rather try better methods first.
I said expedient fashion. I didn't say 1 day.
I also said clearly that it's my opinion, so what "most of us" do doesn't mean I agree with it.
If you get greedy and bite off more than you can chew, be prepared to deal with the consequences.
As the OP has made readily apparent, float ability is not the only factor to be considered. And as I have learned in years of experience in various occupations and activities, the factors which you don't consider cost/kill you.