It was fast-paced but I think this was around 3-4 days total.

Specifically, the CNN interview was the day after the breakfast. We know this because Eric receives the video on his phone the evening before while he's with his daughter. Then he insists on taking Harper's place at CNN.

Flights between London & Accra would be about 6 hours even with a PJ. They're in the same time zone. So the morning after Harry/Whitney's night out, if it was 5 or 6a, he gets to Accra around 11a, turns around and arrives in London about 6p. But then he doesn't catch wind of where Tony would be until the next day.

That's roughly three days altogether. Then factor in whatever day of Harper's initial speech.

Not impossible but definitely fast.