Firefighters are dousing new sparks as they work to contain the massive Tasman blaze and let residents from the valleys to return to their homes.
A Fire and Emergency New Zealand spokesperson told residents at a community meeting on Wednesday that conditions are dry and hot on the hills.
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"The fire is saying 'you know, I'm not over yet I'm still running this show' and there's still a fair bit of life in there."
A firefighter had to be hospitalised due to dehydration from fighting the blaze, but she's getting better now.
"I'm happy to say that she's recovering very well today, but it reflects the conditions people are working in up on the hill," the spokesperson said.
Residents of Eves Valley, Teapot Valley, Golden Hills and Redwood Valley have restricted access to their homes.
But the fire spokesperson said it will be a while before things go back to normal.
"It is slow progress and it's something we have to do properly and it's going to take a long time."