As the title says. It's a long standing problem, but one nobody has addressed. (Because it's a minor issue, I know. It's still an issue regardless.)
Why? Mainly the case of not being able to use any pets while incubation is in progress. Either shorten the length and add a cancel button, or allow us to use a pet mid incubation and add a cancel button.
Also those who kinda fat finger the incubation and are stuck either waiting 24 hours or paying 15p. If you don't have 15p you're S#&$ outta luck.