7", 10" recommended playing times

I not sure why I'm having so much trouble finding this on the web. Can
anyone tell me the recommended range of playing times for 7 inch and
10 inch vinyl at 45 and 33 1/3?

I think 20-22 minutes per side for LPs at 33.3 rpm.

The longer the worse the fidelity because the grooves are too close together.
Also, expect the fidelity to decrease as you get past the center point to
label due to increased curvature of the groove.

Ragards,

Ty Ford

It depends on the material, how loud you want it, how much bass you have,
the cutting head, lathe and the skill of the operator.

Most mastering houses will list what they consider to be acceptable,
although even THOSE numbers can sometimes be negotiated.

I had a 12" vinyl titled "The Giants of Jazz" which ran 31 minutes on
one side, which is the longest I've seen. I know that that has no
relevance to your original question, but what the hell, it must be
some kind of a record. The shows we used to get in AFRTS came in on

You'll notice that it had very low levels, though, and probably a high
noise floor too.

Murray Hill Records actually managed to get the entire Beethoven's Ninth
on a single LP, running more than 40 minutes on a side. It sounded just
awful, but it sure gave the radio announcer a long bathroom break.

So did Seraphim. It was awful. (And a lackluster performance too.)

Peace,
Paul

vinyl and ran 30:00 per side, but they were limited in response for AM
radio. (The "record" pun was unintentionoal. Sorry.)

They were also mono. It's a lot easier to cut mono discs than stereo,
and if you cut with a real mono head (and not a stereo head in mono mode)
you can get very precise depth control which helps you position the grooves
a little more tightly.