further to the above - just curious, since i've not done the maths nor been in that situation... but... you would be doing more than a 180* turn in such a case right? Unless there were a parallel runway under you at whatever point you roll out of your 180, wouldn't there be an additional loss in then getting yourself back to the runway you were on? I'm envisioning a turn that looks a bit like an enlarged question mark or an upside-down J.
worth mentioning, or am i overthinking?