No fixed termination date. It's when the reserves run out or more specifically when production/receipts fgo below certain thresholds. The trust gives an estimate in the quarterly and annual filings. They say 5 years and that may be conservative, ie. it may run a few years longer. However under current NG prices you can extrapolate the recent quarterly payments and project how much it will pay out over 5 years and it's not that much. The only hope for DOM to be a good investment would be a significant increase in NG prices that happens very soon and is sustained for 5 years or more. I don't see a real rebound in NG prices for a few years yet. 2013 may be slightly better than 2012 and so DOM's distributions may be a little higher than last years, however not enough to make a fundamental change in the outlook for the trust. Their problem is simple - they will exhaust their reserves while NG prices are low. By the time NG really recovers in a number of years, it will be too late for DOM to benefit as they will have little reserves left. There are other NG trusts which will be producing for decades so really no reason for anyone to bother with DOM unless the price gets really low.