8600-8700m should already be within reach

Pace Watts Cal/Hr s/m
30:00.0 8,504m 1:45.8 295 1315 28
5:00.0 1,385m 1:48.3 276 1247 26
10:00.0 1,387m 1:48.1 277 1251 25
15:00.0 1,404m 1:46.8 287 1286 28
20:00.0 1,417m 1:45.8 295 1314 29
25:00.0 1,426m 1:45.1 301 1333 31
30:00.0 1,486m 1:40.9 340 1469 34