"A time limit? Mama and Papa can shift their forms, but there is no... exact time limit. It's only that it grows more difficult to remember what you were the more time passes. And that takes longer than two hours." A strict two hour limit seems harsh. The only changes that are worse in her own world are shifts to Immortal form.

She leans forward and daintily snatches another bite. "Can all humans shift their forms in your world?"