That's a good time.
Well done to your mum.

@Hair Pot - A decent runner should be able to do a marathon in under 4 hours. A friend of mine has run them in about 3 and a half.

You could walk a half marathon in 3h 52m.
( K2k6 has a proper job these days, Mon 18 May 2009, 8:52, 2 replies, latest was 16 years ago)

Fair enough.
I wasn't sure what average time for a runner. It just sounded too fast - but if it isn't, I'll go with that.
(Potty Jag har smör i min rumpspringa, Mon 18 May 2009, 9:07, Reply)

Erm
That kind of sustained walking speed is mental. Most people average about two and a half miles an hour - I'm just over three mph and it's hard work.

Accomplished walkers could do a half marathon in that time. Experts in just under three hours.
( Noeli overtheshoulderboulderholderthingstraplatchboobs, Mon 18 May 2009, 9:20, Reply)

I've just realised you mean just under 3.5mph
which isn't terribly quick, but I'd still defy anyone who hadn't trained to sustain that pace for that time :)
( Noeli overtheshoulderboulderholderthingstraplatchboobs, Mon 18 May 2009, 9:37, Reply)