What is pages, is this an App?
Check your ipad settings -->General --> Auto-Lock --> choose never
What ios version are you running?Settings --> General --> About --> Version
Not about the ios version, I saw the message about dictation not staying on.
From what I can tell, there is no way to increase the time. It's set to 30 seconds.
I don't think there is a way, it's coded for 30 seconds is all. I will open this up in case someone else has a better answer for you.
No there is no way to extend that in Pages or any other app that uses the built in dictation. It has to upload that to a server to translate it. There are apps that can do it like this one: