17-mile run!

I only have about 3 weeks of serious training left before tapering off in preparation for running the Marathon on July 29th. This past Sunday I ran with a group from a local running club that are also training for the S.F. Marathon. Those training for the Half Marathon ran for the first 10 miles and the rest of us continued on a longer run. The Marathon training group were putting in an 18 mile run. I was aiming for 16 miles so I didn't stay with them and took a slightly shorter route. The route I took came out to be 17 miles and included a lot of hills. The biggest climb started around the 10-mile mark. This turned out to be almost a 1000' climb over the next 3 miles. For reference, the tallest hill in San Francisco is Mount Davidson which is 925' high.
By the time I reached the top my legs were sore and tired - and I still had 4 miles left to go. The last few miles were tough but thankfully mostly downhill. By the time I was done I was beat! Needless to say I didn't do much the rest of the day...
Next weekend I'll attempt a 20-mile run - that should be interesting!