i know this is a joke, but i will answer anyway.
if she has time, sure, why not. i think 3 hours is ridiculous and i can't imagine listening/watching the trump one for 3 hours holy shit. if they can figure out a way to do it for 60-90 minutes, that makes sense.
i will say this - several times during the limited clips that i saw, trump tried to get rogan to take the bait and say something shitty about kamala, and joe refused to do it every time. i'm sure his listeners were hoping he'd talk shit, and he didn't.
he's been outwardly very cordial and straightforward about what he wants from the interview, and i would expect the same amount of pushback he gave trump on his answers, which is not much. he said he wants to talk to her and learn about who she is personally, and he at least seems respectful when he says it.
all that said, i don't think it would help her win the election, and there's a 100% chance that something during those 60-90 minutes would become "controversial" and a "gotcha" moment for the maga goons, and they would screech about it for a week, and i don't love that.
tl;dr - i don't see much harm, but i also don't see much upside. rogan isn't some traditional requirement that candidates have to go on before they run, and i don't want to set that precedent now. he can interview her in a month when she's pres-elect, and it'll be wherever she wants it to be.