Record setters for longest tape

[Telecolor 3007]

I've seen 300 minutes V.H.S. cassettes. But I think they are only for P.A.L./S.E.C.A.M., because for N.T.S.C. recording you need a higher speed for the tape.
Din't buy one because it the instruction manual for my 1986-1987 "Panasonic" NV-630 PX V.H.S. V.C.R. it's mentioned that in can record in S.P. mode maximum 240 minutes... (or it is beacuase back then there still wheren't made E-300 V.H.S. cassettes?).