I just did a quick calculation using that $1 trillion figure divided by 10 million barrels a day US need (presuming that in a few years we can reduce our need slightly with electric cars and higher fuel standards among other things). This gave me a figure of about 274 years supply with the current technology. This of course assumes we don’t leave it in the ground. I agree with another poster here that we should use a fair bit of other peoples’ oil and gas if we can (at economically sound prices) and save ours for later.
No doubt we’ll find many deposits and perhaps invent other energy sources in the next 274 years.