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?).

It could be a bad translation of estimated record time based on a standard shorter length tape.

Longer tapes tend to be thinner and more prone to be stretched by decks (some decks were worse than others). I'd imagine that if that was a problem it should be mentioned in the manual. The worst that I can imagine happening if you try one of those tapes is the tape slowly becoming unplayable. I'd record and play back short test recordings on that tape starting at 30 seconds and progressing up to 2 hours if there is no signs of stretching or other troubles after progressing through those tests then odds are there will never be problems.

I would think they would have to be cause there is only so much room in the shell!!

Anyway, I used E-240 cassettes. In N.T.S.C. they woul be T-174.
Yes, longer tape = thinner tape.
I see the longest tape for N.T.S.C. was T-240, which could record 250 minutes (4 hour and 10 minutes) on S.P. mode.

Ya my friend was talking about T 200s on another VBB site Im on,I havent ever seen one...

http://www.sitcomsonline.com/boards/...d.php?t=120048

A D-VHS tape type DF-480 could store 4 hours in analog SP mode or 40 hours of digitally encoded SD content on the PS5 record speed...

40 hours??

Whoa.......

This makes wonder about the tape data capability... well, most big servers stores data in tape cartridges (of server type). For data not instantly being requested.
One single layer DVD is good only for ~2h of digital video content...

A single layer DVD has about 4.7 GB capacity. The duration of the video recorded depends on the bitrate.