Didn't see the post til now. Well done young pasta, I don't think that's a bad time, particularly for the first run. Not that I know anything about it, I get tired just watching! Great cause too.
this is I think the longest race you can do from scratch ( unless you walk a marathon in a few days) and some people do - and suffer the next day ! and the thing about training runs of 6 miles is that you can think - oh well I just tack another one on at the end and I KNOW I can do 6 miles ! apparently the greatest barrier to doing them regularly is ... boredom. I used to run along canals