"People introduce me at things as the Prime Minister, I start clapping and look around and realise they are waiting for me to get up and speak."
Davis is required to fill in for Ardern's usual television and radio interviews, attend public events, and potentially make major decisions if Ardern cannot be reached.
So does he get more staff to help him with the larger workload?
"No, but it does mean [the diplomatic protection squad] have to accompany me to the Kaitaia RSA.
"Sometimes when I don't have DPS tailing me, and people ask if they are there, I tell them they are and offer $10 if they can spot them. I love it when they go: 'Far, they are good all right'"
And while there are some perks, he does not get to occupy Ardern's office on the ninth floor of the Beehive.
"No, we just shift her whisky cabinet down a couple of floors" he said.
"Seriously though, it is an honour and a privilege to fill in for the Prime Minister while she's overseas.
"In this digital age the PM is usually contactable, but in the acting role I could be responsible for making some big decisions if they are needed. That's a responsibility I don't take lightly."
Davis' workload is relatively light. It is a recess week at Parliament, so he is not required to lead Labour at Question Time. He is appearing at about five public events.
While Davis is only in charge for a week, Peters will take on the top job for six weeks when Ardern goes on maternity leave in June. His powers during that period include the ability to sack ministers or even call a general election.
Ardern's office said Peters would get all of the same briefings as the Prime Minister, but would speak to her first before making any major decisions.
"If a significant matter arose, the Acting Prime Minister would of course consult the Prime Minister before taking action."
