"What did you do with your down time then?" Because he had to have had it, he couldn't keep going for a full standard day, every day. Even the prisoners on Wobani got breaks -- admittedly, their breaks were solely to sleep, but that's irrelevant.

"You had to have it, there have to be rules." The Alliance was still fighting a gentleman's war on the surface, ignoring what Intelligence did in the shadows. Mon Mothma had too much idealism to work her soldiers until they crumpled, exhausted.

Jyn knows the exhaustion was emotional more than anything, she doesn't forget Cassian's speech cementing himself and his men to Rogue One's cause.