Labour's pushing for the public to have more time to have their say on TPP related legislation.

Parliamentary hearings on the controversial trade agreement are currently underway, with the 11th of March the final date for public submissions to be made.

Labour MP David Clark wants that pushed out by another month, and said the TPP is a 6000-page document and its vital those reviewing its texts have the time to make a meaningful submission.

"The requests for an extension are now becoming much louder," he said.

"I am going to put that case to the Government and I hope they listen to the public of New Zealand."

Minister of Trade Todd McClay has previously said while it's a matter for Parliament's Foreign Affairs, Defence, and Trade Select Committee, he's open to working with them to extend the period.

Meanwhile, Clark's adamant the TPP breaches one of Labour's bottom lines - that the Government be able to ban land sales to foreigners.

He contests any suggestion that Ministry of Foreign Affairs and Trade negotiators took a position in TPP talks that was consistent with Labour's position.

"Labour's bottom line on land sales was absolutely clear in 2013 when the policy was announced.

"It was also reiterated when Labour and Andrew Little announced the five bottom lines that that meant a ban on non-resident foreign speculators."