My first Public Talk, back in the 1960's was the full length version. It was about the flood and I actually believed it then. The audience clapped at the end, mainly relief that it was over rather than appreciation for the delivery I'm sure.
I do not remember anyone going out for a fag after the talk, we all had a cup of tea and then got on with the WT.
I don't think many in our congregation could manage an hour's talk, I certainly could not imagine listening to any of our lot for that length of time.
One slightly good thought, you were able to count an hour on your service report for giving the talk.
George