30 min 'run dry' time doesn't mean that you can run for thirty minutes without MRGB oil before landing; it means (IMHO) that you should consider that you have 30 mins max to effect a landing in the safest place possible, and the closer you are to the 30 mins point the closer you are to a catastrophic failure. The captain's primary responsibility isn't to maximise profitability for the shareholders, or even to minimise the cost of an aircraft recovery; it is to maximise and ensure, as far as is possible, the safety of the passengers. On the basis of the limited information available thus far, the captain here achieved that admirably. Kudos, my friend; I'm glad I've never been faced with that situation.