I'm 57, 6'2" and a beginner. My current 30:00 is 7638m, that was about 6 weeks ago and since then I've improved my 2K by 20s to 7:19,3. Beginner's gains!
My first 30:00 effort looked like this:
Time Meters Pace Watts Cal/Hr S/M
30:00.0 7,638m 1:57.8 214 1036 23
6:00.0 1,526m 1:57.9 213 1033 24
12:00.0 1,517m 1:58.6 210 1021 23
18:00.0 1,523m 1:58.1 212 1029 23
24:00.0 1,521m 1:58.3 211 1026 23
30:00.0 1,551m 1:56.0 224 1070 24
So, basically I held about 1:58 and gave it the beans in the last few minutes.
I'd really like to average 1:56 to get 7750. My endurance is a bit iffy so 8k is way out of reach at the moment.
Are there any "accepted" strategies for the 30:00 other than "suffer and hold the damn split"?

Phil