What's the maximum time between random numbers on the RNG peripheral?

[CurtisHx]

What's the maximum time between random numbers being generated on the nRF52832's RNG? The datasheet just says

The time needed to generate one random byte of data is unpredictable, and may vary from one byte to the next. This is especially true when bias correction is enabled.

But how much "unpredictability" are we talking here? What's the maximum time between generated numbers? 50 milliseconds? 1 second? Unlimited?

[Matt]

Should be less than the time to find your next date :) For my application I did not recall the time delay to be more than 1 second..but I could be wrong here.

[CurtisHx]

I just ran a quick 'n dirty experiment on the dev kit. I toggled a GPIO inside of the RNG VALRDY interrupt and looked at it on the scope. After running for a few minutes, it looks like the max time is 35µs and min is 31µs with bias correction off (CONFIG = 0). With bias correction on, max time is 2.27ms and min time is 74µs. There's something going wrong with my code. I don't think the RNG is malfunctioning.

[run_ar]

As you have measured already the time it takes to generate a value will vary as this is generated based on noise. This is especially thru when bias correction is on, which is the recommended setting if you need a uniform distribution of 0 and 1.