In the Alps, "A hilly route over one or two cat 1 climbs is typically about 3000 meters climbing for 100 kilometers."
I'm not able to think metric easily. That's about 10,000 feet in 60 miles? Stage 20 of the Giro d'Italia included about 130 miles and 20,000 feet of riding. Ouch!
Of the organized 100 mile rides I've been on, 5,000 feet in 100 miles would be typical, or about 16500 meters and 160 kilometers.
I configured my ride of a couple of days ago in the Santa Monica Mountains. After a flat three mile warm-up, I rode 1400 feet in six up and down miles, before heading for the flatlands.
That works out to, I think, about 23,000+ feet in 100 miles (if I could actually keep going that long). Or for a metric century, 4700 meters in 100 kilometers.
Actually, I've kept that pace for 5,000 non-stop feet of climbing in 21 miles. THAT's hilly.
__________________
This post is a natural product. Slight variations in spelling and grammar enhance its individual character and beauty and are in no way to be considered flaws or defects.