My first real ride was 55 km, on an old mountain bike, on rolling hills, at 100 degrees temps. I won't say it was easy, but I did it and was darn proud of myself. If I was as knowledgeable then as I am now, I never would have done such a challenging ride. Not sure that's a good thing.

Anyway, the training comments are correct but from what I've read about Karen, she's a fairly experienced cyclist and can probably manage it. I do think she should do some easy rides during the next 3 weeks though.