Hey! I ran my first marathon in LA last weekend, too! My chip time was 4:14:00. I probably saw you there :-) Well, I too was shooting to break the 4 hour barrier, and did not reach my goal. I found on the LA course, that the hilly last 10K really blew any hopes I had. In my (completely non-expert) opinion, 4 hours is certainly attainable, though. My longest run in training was only 19 miles and now I think that it may be worthwhile to do at least one run that is 23 - 26 miles. I don't know about you, but I was right on pace until the last 10K - then I died. Don't lose sight of that 4 hour goal... I'm definitely not! Are you planning on LA next year? If so, I highly recommend the Chicago Program which is outlined in Hal Higdon's book. It is really easy to follow and if done religiously (which I plan to do NEXT time) I think it could help get a second-time runner below that 4 hour mark. Good luck!