pfff good luck with that. i made a PF track once with the restriction that it had to be build on a 5x5 base, and that was tough. a super-long pf track would take a lot of time to test over and over.
anyway, since i've been around here for quite a while, i've seen some long PF tracks already:
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Pingo Flamin (marci), this one i knew by heart, one which i thought was the longest with 11:38.
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Moon Fight (bruno333), however, when i looked for the url of the previous one, i stumbled across this one, which is 12:12.
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Longest PF (marci), however, technically the longest PF, but not an 'interesting to watch' PF, is this one, by the same author of Pingo Flamin. this one's boring as hell, but is in fact 2219:32...!
good luck building the longest! i think you'll have to pass the 12:12 barrier for that. however, other kind of restrictions can be quite interesting as well (f.e. my
5x5 track, if anyone's interested - btw, you cannot play it in the current version of the game, you'll need TMN ESWC for it).
Good one!