It's the combination of the cap size and R2 size.

Increasing R2 value at some point will run into the cap's internal leakage
(just like the temp gauge blinker timeout circuit) and fail to time out
and/or become excessively sensitive to humidity and board contamination.

Yrs,
d

On Sun, Aug 6, 2017 at 10:03 PM, Alistair Bell <albell@shaw.ca> wrote:

> Ok, I'm not going to pretend to know... is it just the cap that determines
> delay time?
>
> Ab
>
>