Thanks John,
I will try that. I assume the way to do that is by the filter you mentioned on the get hub page, like this:
add_filter('acf/prevent-timeout/time', 'my_acf_timeout_time', 10, 2);
function my_acf_timeout_time($time, $post_id) {
$time = -1;
return $time;
}
Is that correct?