Thanks for the input. I went to the Beginner Triathlete site and decided to use their beginner HIM RPE plan. I'm much happier now and don't feel like I'm killing myself training. My goal is finishing at or under 6 hours, which should be do-able assuming I can go 45 in the water, 18.5 average on the bike and run at a 10MPH pace.

The longest run for me so far has been an 8 miler, the longest swim 3000y and the longest bike ride 75 miles. The fastest I have gone for a long distance on a bike was 20.2 MPH average for 41 miles last summer.

So hopefully if I follow the plan I'll make it in or under 6 hours total...