IF for a 8-9 hours gran fondo

Racing
9

For what it’s worth:

  • La Marmotte 2. July 2016: 173 km, 4,721 m elevation gain, 7h 57m, 214 NP (71% of FTP), 0.72 IF, 417 TSS.
  • Tour du Mont Blanc 15. July 2017: 324 km, 7,826 m elevation gain, 14h 1m, 202 NP (67% of FTP), 0.71 IF, 712 TSS.
  • Jotunheimen Rundt 29. June 2018: DNF at 248 km, 2,860 m elevation gain, 7h 19m, 225 NP (75% of FTP), 0.76 IF, 428 TSS.

I would say an IF around 0.70-.075 makes sense.