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It is understood the changes relate to shorter stays that will free up MIQ places over the next few months.
However, a proportion of them will likely be needed for community cases, and so not all will be freed up for people trying to return from overseas.
It has been more than a month since the government ditched a first-in-first-served allocation system for a randomised lottery scheme.
While it gives everyone an equal chance of securing an MIQ spot, many argue it still does not help the most desperate.
Covid-19 Response Minister Chris Hipkins earlier downplayed expectations, saying the number of additional MIQ slots would likely be "modest".