It didn't seem like a long span of time between putting the plate down and Peter happily requesting to do the dishes.

No.

Ignis turned around from the warm water and shook his head. "I'm afraid the Blue team has kitchen clean up duty but I appreciate your offer."

He was doing this as a repayment of Peter giving Tony the go ahead so nothing would be accepted at the time. However, he knew no only went so far with Noct. So he tried another route.

"You said you can..stick to things. How long have you been able to do that?"