All I know is, on Day 2 of last year's RI MS150 (after doing the century option on Day 1 in 87 degree humid heat), talking to another rider got me through the next-to last leg (in 88 degree humid heat). Talking made me forget how much I was suffering.
This winter demonstrated seriously elevated fitness over last year on the trainer, so hopefully the misery index will be lower this year and I can chat just to be sociable.