It's still unclear whether the final outcome of the talks will be decided on Monday, or whether the New Zealand public will have to go on waiting until later in the week.
Asked if that means a decision will come next week, he said: "That's not what I said".
Wearing a tie emblazoned with repeated TGIF lettering, shorthand for Thank God It's Friday, Mr Peters revealed members of the board would fly to Wellington on Sunday night and Monday for the meeting.
But the self-imposed deadline has now passed and Peters has advised he may need until the end of next week to reach a decision, which must be approved by the caucus and the NZ First board.
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After the 23 September election the National party was left with 56 seats and Labour 46 - both short of the 61 needed to form a government in the 120-seat parliament.
The leader of the small New Zealand party holding the balance of power after an inconclusive election last month said he would hold a key board meeting on Monday as he nears a decision on which party he will support in a coalition government.
New Zealand First MPs are now in an all day meeting today.
He expected constant communication between his party and National and Labour through phone and text, but there were no more face-to-face meetings planned.
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Mr Peters confirmed this afternoon he will be meeting with his board and caucus to thrash out a decision on Monday.
"They give up their valuable spare time to take part in board meetings and attend to other matters, and we are grateful for that".
Negotiations finished yesterday, but ministerial portfolios haven't been discussed.
They contain details of the concessions offered by National and Labour that will allow NZ First policies to be implemented by the next government.
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"Obviously they [NZ First] have got to chew the fat amongst themselves and see which way they are going to go ... we respect that".