It was a joke,
First time I went to Alaska was 2009, I flew and met my parents up there. I stayed a week, but that's not enough.
We drove a loop from anchorage, north to the denali hwy, then east to Paxson (I think) and then south, and west back to anchorage. We basically drove every day, since I only had a week, we didn't do much other than that. I'm rambling......
We did stop in Petersville to do a little gold panning, and my dad told me at some point, "we better start heading back to the camper" and I told him let's just stay another hour, he showed me the time and it was midnight.
I would have guessed no later than 8. But yeah, big difference up north in the daylight hours