No, a sub-20 would most likely be too fast - thanks for the vote of confidence though! I was thinking sub-24.
I do plan on joining quite a few of MrMin's training hikes though - trained with him on a few hikes before OTW and he gave me a lot of pointers/advice. He also pushed me beyond my comfort threshold and I was quite pleased with my progress. Not sure if I will be around for OTW next year. If I am around, I will try to secure a team via Meetup.