G'day Tim, I haven't steamed this yet as it was 40°C here yesterday and we had the A/C's on and I didn't want to stink the house up.
It will be interesting to see how many mils of water the boiler takes and how long a boiler full of water runs for.
I have a logbook and write all this information down for each of my engines.
From what I've read Jim, you'll get a safe 15 minute run out of it, not bad really.