Based on the context and the answer, generate a question. 

Context: As I ' m writing this we are getting read to leave to take a train up the mountain and hike to a glacier and have a picnic lunch . Yesterday we did n't do much but did see the end of a big 166 kilometer hiking / run / race around Mount Blanc . It is a crazy thing and the winner finished in 20 hours !

Answer:

The amount of time it took the winner to get to the finish line .



What impressed them most about the race they had watched the day before ?