Yes. You will have sufficient time. United is pretty much all in one big area. It can still take 15 minutes, but 51 minutesis doable.
You can check today's arrival/departure info to see the current gate togate distance. They tend to keep the same gates.. not always, but usually.
I agree. DEN is a great airport and easy to navigate.
Yes, with an on time arrival 51 minutes is plenty of time, and even with a small delay of 15-20 minutes or so you should be fine. All United flights use the B concourse which, yes, is a hike from one end to another if you're really unlucky, but there are travelators.
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