[retsibsi]

> Then just use 0.75 or 0.5x speed?

I think this often sounds unsettling (like the reader is drunk or otherwise impaired), and anyway the listener doesn't need more time to recognise each individual word -- they want time to take in sentences and paragraphs.

[satvikpendem]

Get a text to speech app and change the lengths between sentences while keeping the actual read aloud speed the same, I recall using something like that before.