I believe the limitation is set by the CC standards.

I believe the limitation is set by the CC standards.

Hmmm.... Amazon's Prime Video helpdesk told me they'd accept up to 35 chars per line hence my use, as the extra characters are helpful when squeezing text in. It would be useful to be able to make Vegas use the same limit.

(Edit: some Googling shows Netflix accept "around 42", Permondo spec 35, the BBC say 37, the ISDCF say 30, and the UK's Channel 4 say 42!)

Closed captions and subtitling aren't the same thing. Which are you referring to? How are you creating them?

I call 'em subtitles, maybe you call them closed captions; they seem to be pretty much the same thing to me - words at the bottom of the screen showing what's being said. I think you know what I mean though, arguing the semantics doesn't assist in solving the issue, alas. They're added in Vegas using by pressing "c" which drops a marker with the text and subtitling commands you want to use.

They're not really the same in Vegas. Closed captions can be embedded and exported as a file. Upon playback toggled on and off by software, vs titles (placed at the image bottom, hence sub) that are burned into the video itself. I use the latter which has no particular character limit.

You can do that by selecting a time range, adding a region to the project (r) and then insert subtitles from regions. Select subtitle as the type. It creates generated text.