XC ski question

I did this last year for the first time and learned how to XC ski (classic, not skate) in February. I did go 2x/week until the race.

My strava from last year to see elevation and general distance:
www.strava.com/activities/9157680332

I think every leg is tough for different reasons. Some might think the XC ski is easiest or toughest. XC ski is a mass start and that adds to the confusion and difficulty. Canoe and road bike are the longest duration.