How come "I won't be long" was used, not "it won't be long"?
Native speaker’s answer
Rebecca
Both of these sentences have the same meaning, but the "I" and "it" change the point of view. Here, Peppa Pig's dad uses "I" to emphasize that he is the one doing the action. This is called the first-person point of view, where the speaker uses themselves as the subject. If he had said "it won't be long", he would be changing the point of view and speaking in the third person where time becomes the subject. However, both sentences are correct, and it is just a matter of the speaker's preference.