When sending an approval email through Flow, if no answer is received within 30 days, the Flow times out and fails.
In some cases, 30 days is not enough time to receive an approval.
Please increase Flow approval timeout to 60 or 90 days.
You can now do this with the new Create Approval (v2) action. Read more here: https://flow.microsoft.com/en-us/blog/2019-release-wave-2-plan-and-may-updates-for-microsoft-flow/
And it's basically not Approval timeout, but the overall timeout of a Flow.
Yes, please it is for general Flow Timeout, not just approval.
If we increase approval timeout > 30 days, flow duration will obviously be extended as well. so yes, both. In my opinion, based on what I see on the field, we should reach at least 1 year. (even if we have to pay for it).